noun
Refers to a pocket sewn on the inside of a garment, such as a jacket or coat.
上着の内ポケットに財布を入れた。
I put my wallet in the inside pocket of my jacket.
General word for 'pocket'; 内ポケット specifically means an inside pocket.
Compound of 内 (uchi, 'inside') and ポケット (poketto, 'pocket').