To provide a claw fixing structure of a wall-mounted indoor unit, which surely fixes the end of a back side of a front grille to a side of a bottom frame.

This fixing claw structure of the indoor unit 1 has a first frame-side claw section 41, a first grille-side inserting section 42, and a first grille-side claw section 43. The first frame-side claw section 41 is composed of a projection projecting toward the outer part of the bottom frame 21, and has a first frame-side inclined surface 41a inclined toward the back side toward the outer part of the bottom frame 21. The first grille-side inserting section 42 is composed of a hole to which the first frame-side claw section 41 is inserted from the inner part of the front grille 31. The first grill-side claw section 43a is formed on a first grille-side inserting section 42, and composed of a projection projecting toward a front part, and has a first grille-side inclined surface 43a in contact with the first frame-side inclined surface 41a at the outer part of the projection, when the first frame-side claw section 41 is inserted into the first grille-side claw section 42.