diff --git a/app/controllers/mentor/practices/submission_answer_controller.rb b/app/controllers/mentor/practices/submission_answer_controller.rb
index c3c270019e3..9988a7daa3f 100644
--- a/app/controllers/mentor/practices/submission_answer_controller.rb
+++ b/app/controllers/mentor/practices/submission_answer_controller.rb
@@ -5,7 +5,7 @@ class Mentor::Practices::SubmissionAnswerController < ApplicationController
   before_action :set_submission_answer, only: %i[edit update]
 
   def new
-    @practice = find_practice
+    @practice = Practice.find(params[:practice_id])
     @submission_answer = @practice.build_submission_answer
   end
 
@@ -14,7 +14,7 @@ def edit
   end
 
   def create
-    @practice = find_practice
+    @practice = Practice.find(params[:practice_id])
     @submission_answer = @practice.build_submission_answer(submission_answer_params)
     if @submission_answer.save
       redirect_to practice_submission_answer_url, notice: '模範解答を作成しました。'
@@ -38,10 +38,6 @@ def set_submission_answer
     @submission_answer = SubmissionAnswer.find_by(practice_id: params[:practice_id])
   end
 
-  def find_practice
-    Practice.find(params[:practice_id])
-  end
-
   def submission_answer_params
     params.require(:submission_answer).permit(:description)
   end
diff --git a/app/controllers/practices/submission_answer_controller.rb b/app/controllers/practices/submission_answer_controller.rb
index 73adde391a1..98812b69107 100644
--- a/app/controllers/practices/submission_answer_controller.rb
+++ b/app/controllers/practices/submission_answer_controller.rb
@@ -4,21 +4,17 @@ class Practices::SubmissionAnswerController < ApplicationController
   before_action :check_permission!, only: %i[show]
 
   def show
-    @practice = find_practice
+    @practice = Practice.find(params[:practice_id])
     @submission_answer = @practice.submission_answer
   end
 
   private
 
   def check_permission!
-    practice = find_practice
+    practice = Practice.find(params[:practice_id])
     submission_answer = practice.submission_answer || SubmissionAnswer.new(practice:)
     return if policy(submission_answer).show?
 
     redirect_to practice_path(practice), alert: 'プラクティスを修了するまで模範解答は見れません。'
   end
-
-  def find_practice
-    Practice.find(params[:practice_id])
-  end
 end