Musculae strength relax implement of hand type

A muscular strength relaxing instrument of a hand type is provided to have a compact size to be gripped by a user's hand, and to be applied to user's arm, neck, thigh, etc using connection unit. A muscular strength relaxing instrument of a hand type includes a case(110), a muscular strength relaxing unit(140), a driving unit, and an operation portion. The case includes an upper case(111) and a lower case(113) on which a gripping portion is formed to be gripped by a user's hand. The muscular strength relaxing unit is connected to the lower case and generates vibration on a part of a body that comes into contact with the muscular strength relaxing instrument by a linear reciprocating motion. The driving unit includes a driving motor, a decelerating pulley, a pivoting pulley, a cam shaft and a connecting rod.