BED DEVICE

PROBLEM TO BE SOLVED: To provide a bed device in which a stopper member is easily detached/attached from/to a cap, and a mold structure of the stopper member when molding is not complex.SOLUTION: The bed device 1 includes: a cap which is fitted to an end part 31 in a cross direction of the bottom 30 with respect to the bottom 30 for supporting a mattress; and a stopper member 50 which is detachably mounted on the cap 40 and prevents the mattress from shifting. In the bed device 1, the stopper member 50 vertically holds the cap 40 by a first mounting part 53 formed on a first abutted surface 56a abutted with the upper end of the cap 40 and a second mounting part 54 formed on a second abutted surface 57a abutted with the lower end of the cap 40, and is provided with an opening part 55 between the first abutted surface 56a and the second abutted surface 57a.