To provide a massager being constituted into a thin shape and facilitating the manufacture.

This massager is provided with a therapeutic sheet 5 having a first sheet material 11 and a second sheet material 12 superposedly provided on the first sheet material 11. The therapeutic sheet 5, in its inside, is provided with a channel part for passing fluid, and a balloon part 8a communicated with the channel part and inflated by the fluid for a therapy. The channel part is formed of a recessed groove provided in a mating face between the first sheet material 11 and the second sheet material 12.