To provide a thumb-turn for fittings operable with one finger and particularly operable with one finger to be locked or unlocked even when mounted to a wall surface higher than the upper end of a door, for instance, and easily uniting two or more grip pieces in a cross state.

The thumb-turn for the fittings comprises the first grip piece 17 and the second grip piece 18 united in the cross state at the center part of the first grip piece 17. These first and second grip pieces 17, 18 are arranged not to project from a thumb-turn recess 15.