To provide a pair of inner socks looking nice through securely preventing slippage at the time of wearing.

This pair of socks 100 has five cylindrical insertion parts 2 to individually hold the toes and outwardly expose each of the toes, and a main body part 1 connected to insert into the cylindrical insertion parts 2, covering from the sole to the heel at the time of wearing on the foot and having an opened top so as to outwardly expose the top side 22 of the foot. The cylindrical insertion part and the main body part 1 are uniformly sewn by a moisture absorption fabric. The opening part 3 of the main body part 1 is set with an elastic member 5 and formed in a large manner so as not to outwardly expose the inner socks 100 at the time of wearing with shoes on. As a result, the inner socks 100 is securely held through inserting the toes into the cylindrical insertion parts 2, and prevented from slipping inside the shoes and being outwardly exposed even if moving the foot.