A notebook or pocket diary used to write schedules, notes, or memos (planner).
毎朝手帳にその日の予定を書き込む。
I write down the day's schedule in my planner every morning.
新しい手帳を買って来年の予定を整理した。
I bought a new planner and organized next year's schedule.
手帳を忘れるとスケジュールが管理しにくい。
If I forget my planner, it's hard to manage my schedule.
Abbreviated usage referring to an official certificate/booklet (e.g., a disability certificate 'shintaishougai-sha techou').
身体障害者手帳を役所で申請した。
I applied for a disability certificate at the municipal office.
An abbreviated usage meaning an identification booklet or badge used for official identification (e.g., police ID booklet).
警察官が職務質問の際に警察手帳を見せた。
The police officer showed his police ID during a stop-and-question.