PURPOSE: To obtain a low frequency therapeutic apparatus with limited change in the sensitivity of a receiving antenna free from the bending of the body.

CONSTITUTION: A low frequency therapeutic apparatus is made up of a remote control 2 for transmitting radio waves and a body 1 which receives a control radio wave from the remote control 2 to perform an operation of outputting a low frequency. An antenna pattern 17 is arranged in the body 1 made free to bend and a means is provided to reduce a change in the projection area within a closed loop formed by the antenna pattern 17. The means may be arranged, for example, that two printed circuit boards 14 and 15 provided with the antenna pattern 17 are with an angle provided on the side of opposite the direction of bending the body 1. A flexible substrate 16 to which are connected printed circuit boards 14 and 15 also may be arranged near a fulcrum at the body is bent.