[PROBLEMS] To provide a supporter and a belt for promoting muscular contraction which can activate muscular contraction movements and enhance metabolic ability to thereby elevate fat-burning efficiency when applied to the body. [MEANS FOR SOLVING PROBLEMS]A tubular supporter (1) to be applied to a part in which it is intended to promote muscular contraction such as the abdomen, arm, thigh or neck, wherein a plural number of net-shaped members (2) having a network structure made of a stretchable material are united with a stretchable band-shaped uniting member (3)； and a belt (10) to be wound around a part in which it is intended to promote muscular contraction such as the abdomen, arm, thigh or neck, wherein the main body of the belt has a network structure made of a stretchable material and a reinforcing core member (15) crossing lengthwise the main body of the belt is provided at the boundary formed each several network blocks.
