A muscular relief apparatus capable of relaxing muscle of a body part includes a case having a space formed therein and a gripping-part that is gripped by a hand; a muscular relief member in contact with the body part and making a vibration by a reciprocal movement; a motor installed in the space of the case for generating rotational force; and a transmission module for converting the rotational force into the reciprocal movement of the muscular relief member. The apparatus further includes a guide rail provided in the case; a moving member connected by the transmission module to apply a linear reciprocal movement along the guide rail; and a plurality of supporting parts installed on the bottom surface of the moving member to support the muscular relief member.