To provide a nursing care auxiliary device for a bathroom for avoiding a falling accident of a person in need of nursing care before and after the use of the bathroom.

A nursing care auxiliary device for a bathroom includes: casters 7 provided in the front and the back of bottom parts of right and left leg parts 21, 22; side part frame bodies 31, 32 vertically provided on upper parts of the right and left leg parts 21, 22 to oppose mutually; a backrest part 5 for connecting the right and left side part frame bodies 31, 32 at the back in a horizontal direction; and a fixed toilet seat 6 to be connected to the backrest part 5. The fixed toilet seat 6 is fixed on the side of a nursing care auxiliary device in a position where the fixed toilet seat horizontally covers an upper surface of a toilet seat fixing part 91 above the toilet seat fixing part 91 of a commode while a rotatable toilet seat of the existing commode is raised upward. The backrest part 5 is provided in a position higher than the fixed toilet seat, and the fixed toilet seat moves to approach the upper surface of the toilet seat fixing part 91 of the existing commode in use.