diff --git a/db/seeds/development/staff_members.rb b/db/seeds/development/staff_members.rb
index c93a276..acfa41f 100644
--- a/db/seeds/development/staff_members.rb
+++ b/db/seeds/development/staff_members.rb
@@ -18,3 +18,37 @@
   suspended: true,
   start_date: Date.today,
 )
+
+family_names = %w(
+  佐藤:サトウ:sato
+  鈴木:スズキ:suzuki
+  高橋:タカハシ:takahashi
+  田中:タナカ:tanaka
+  てすと:テスト:test
+)
+
+given_names = %w(
+  次郎:ジロウ:jiro
+  三郎:サブロウ:saburo
+  松子:マツコ:matsuko
+  竹子:タケコ:takeko
+  梅子:ウメコ:umeko
+  太郎:タロウ:taro
+)
+
+20.times do |n|
+  fn = family_names[n % 4 ].split(':')
+  gn = given_names[ n % 5 ].split(':')
+
+  StaffMember.create!(
+    email: "#{fn[2]},#{gn[2]}@example.com",
+    family_name: fn[0],
+    given_name: gn[0],
+    family_name_kana: fn[1],
+    given_name_kana: gn[2],
+    password: 'password',
+    start_date: (1000 - n).days.ago.to_date,
+    end_date: n == 0 ? Date.today : nil,
+    suspended: n == 1,
+  )
+end