To provide a mounting structure for a counter of a bathroom, with improved workability, capable of facilitating counter mounting work.

A hooking metal fitting is disposed on the side of an upper surface part 2 inside the counter 1 having a U-shaped cross section. On a lower surface part of the counter, a wall surface fixing part is extended from a back side end downward. A fixing block 21 is installed on a wall surface 6 of the bathroom 5. A hooking piece of the hooking metal fitting inserted from above to be locked to a lock part 25 of the fixing block. A fixing member is installed from the wall surface fixing part on the lower surface part of the counter toward the wall surface of the bathroom. The counter is thus installed on the wall surface of the bathroom.