diff --git a/app/javascript/stylesheets/application/blocks/cards/_card-counts.sass b/app/javascript/stylesheets/application/blocks/cards/_card-counts.sass
index b5a49f8afbb..2d8c573ffd0 100644
--- a/app/javascript/stylesheets/application/blocks/cards/_card-counts.sass
+++ b/app/javascript/stylesheets/application/blocks/cards/_card-counts.sass
@@ -43,10 +43,18 @@
   border-radius: 3px
 
 .card-counts__item-label
-  +text-block(.625rem 1.4, center)
+  +text-block(.625rem 1.4)
+  white-space: nowrap
+  display: flex
+  justify-content: center
+  align-items: center
+  text-align: center
   color: var(--semi-muted-text)
   padding-block: .125rem
   border-bottom: solid 1px var(--border)
+  height: 1.25rem
+  &.is-sm span
+    transform: scale(.85)
 
 .card-counts__item-value
   +text-block(.875rem 1.4, center)
diff --git a/app/javascript/stylesheets/application/blocks/user/_user-group.sass b/app/javascript/stylesheets/application/blocks/user/_user-group.sass
index d1da050513d..1a114c51fbe 100644
--- a/app/javascript/stylesheets/application/blocks/user/_user-group.sass
+++ b/app/javascript/stylesheets/application/blocks/user/_user-group.sass
@@ -3,6 +3,14 @@
   &:not(:first-child)
     border-top: solid 1px var(--border-tint)
 
+.user-group__header
+  display: flex
+  gap: .5rem
+  +media-breakpoint-up(md)
+    justify-content: space-between
+  +media-breakpoint-down(sm)
+    flex-direction: column
+
 .user-group__title
   +media-breakpoint-up(md)
     font-size: 1.125rem
@@ -12,23 +20,23 @@
 .user-group__title-link
   text-decoration: none
   color: var(--main-text)
+  display: flex
+  gap: .5rem
   +media-breakpoint-up(md)
-    display: flex
     align-items: flex-end
+  +media-breakpoint-down(sm)
+    flex-direction: column
   .user-group__title.is-inline &
-    display: flex
+    flex-direction: row
     align-items: flex-end
 
 .user-group__title-label
   display: block
   font-weight: 600
-  +media-breakpoint-up(md)
-   margin-right: .25em
   .user-group__title-link:hover &
     text-decoration: underline
 
 .user-group__title-icon
-  margin-right: .375em
   &.is-first
     color: var(--gold)
   &.is-second
@@ -45,4 +53,10 @@
   font-size: .75rem
   font-weight: 400
   color: var(--muted-text)
-  margin-left: .25rem
+
+.user-group__counts
+  +media-breakpoint-up(md)
+    margin-top: -.5rem
+  .card-counts__item
+    width: 3.5rem
+    color: var(--default-text)
diff --git a/app/models/generation.rb b/app/models/generation.rb
index ceaac17527c..508c15e845a 100644
--- a/app/models/generation.rb
+++ b/app/models/generation.rb
@@ -44,4 +44,10 @@ def target_users(target)
     # 退会者は「退会」フィルター時のみ表示させたいため、絞り込みを行う
     target == 'retired' ? users : users.unretired
   end
+
+  def count_classmates_by_target(target)
+    return classmates.students.count - classmates.hibernated.count if target == :students
+
+    classmates.send(target).count
+  end
 end
diff --git a/app/views/generations/_generation_count.html.slim b/app/views/generations/_generation_count.html.slim
new file mode 100644
index 00000000000..3affe408639
--- /dev/null
+++ b/app/views/generations/_generation_count.html.slim
@@ -0,0 +1,11 @@
+- target_labels = %w[現役生 研修生 休会 卒業生 アドバイザー 退会者]
+- target_to_scope = %i[students trainees hibernated graduated advisers retired]
+
+.card-counts__items
+  - target_labels.each_with_index do |label, index|
+    .card-counts__item
+      .card-counts__item-inner
+        .card-counts__item-label
+          = label
+        .card-counts__item-value
+          = generation.count_classmates_by_target(target_to_scope[index])
diff --git a/app/views/generations/index.html.slim b/app/views/generations/index.html.slim
index 9069f145bf7..55c3d51e790 100644
--- a/app/views/generations/index.html.slim
+++ b/app/views/generations/index.html.slim
@@ -44,6 +44,9 @@ main.page-main
                           = "#{generation.number}期生"
                         .user-group__date
                           = "#{l generation.start_date, format: :year_and_date} ~ #{l generation.end_date, format: :year_and_date}"
+                    - if current_user.mentor? && @target == 'all'
+                      .user-group__counts.is-only-mentor
+                        = render partial: 'generations/generation_count', locals: { generation: generation }
                   .a-user-icons
                     .a-user-icons__items
                       - users.each do |user|
diff --git a/test/models/generation_test.rb b/test/models/generation_test.rb
index ef043030e41..b954aa57ecf 100644
--- a/test/models/generation_test.rb
+++ b/test/models/generation_test.rb
@@ -29,4 +29,13 @@ class GenerationTest < ActiveSupport::TestCase
     assert_not_includes Generation.new(5).target_users('retired'), users(:komagata)
     assert_not_includes Generation.new(5).target_users('all'), users(:yameo)
   end
+
+  test '#count_classmates_by_target' do
+    assert_equal 13, Generation.new(5).count_classmates_by_target(:students)
+    assert_equal 3, Generation.new(5).count_classmates_by_target(:trainees)
+    assert_equal 1, Generation.new(5).count_classmates_by_target(:hibernated)
+    assert_equal 2, Generation.new(5).count_classmates_by_target(:graduated)
+    assert_equal 2, Generation.new(5).count_classmates_by_target(:advisers)
+    assert_equal 2, Generation.new(5).count_classmates_by_target(:retired)
+  end
 end
diff --git a/test/system/generations_test.rb b/test/system/generations_test.rb
index 9553354bf54..f4a692d39ef 100644
--- a/test/system/generations_test.rb
+++ b/test/system/generations_test.rb
@@ -42,6 +42,18 @@ class GenerationsTest < ApplicationSystemTestCase
       assert_text '期生別（全員）'
       assert_link '33期生'
       assert_text '2021年01月01日 ~ 2021年03月31日'
+      assert_text '現役生'
+      assert_selector '.card-counts__item-value', text: '2'
+      assert_text '研修生'
+      assert_selector '.card-counts__item-value', text: '0'
+      assert_text '休会'
+      assert_selector '.card-counts__item-value', text: '0'
+      assert_text '卒業生'
+      assert_selector '.card-counts__item-value', text: '0'
+      assert_text 'アドバイザー'
+      assert_selector '.card-counts__item-value', text: '0'
+      assert_text '退会者'
+      assert_selector '.card-counts__item-value', text: '0'
       within all('.a-user-icons__items').first do
         within first('.a-user-role.is-admin') do
           assert_equal first('.a-user-icons__item-icon.a-user-icon')['title'], 'adminonly (アドミン 能美代): 管理者'
@@ -49,6 +61,18 @@ class GenerationsTest < ApplicationSystemTestCase
       end
       assert_link '5期生'
       assert_text '2014年01月01日 ~ 2014年03月31日'
+      assert_text '現役生'
+      assert_selector '.card-counts__item-value', text: '13'
+      assert_text '研修生'
+      assert_selector '.card-counts__item-value', text: '3'
+      assert_text '休会'
+      assert_selector '.card-counts__item-value', text: '1'
+      assert_text '卒業生'
+      assert_selector '.card-counts__item-value', text: '2'
+      assert_text '退会者'
+      assert_selector '.card-counts__item-value', text: '2'
+      assert_text 'アドバイザー'
+      assert_selector '.card-counts__item-value', text: '2'
       within all('.a-user-icons__items').last do
         within first('.a-user-role.is-student') do
           assert_equal first('.a-user-icons__item-icon.a-user-icon')['title'], 'marumarushain1 (marumarushain1)'