PROBLEM TO BE SOLVED: To provide a bed device capable of lowering a floor and having an interlocking mechanism such as a back knee bottom interlocking mechanism. A couch device includes a couch having a back bottom and a knee bottom, and a support frame that supports the couch. The support base includes a first rotating member 43 that rotates when raising the back bottom, a second rotating member that rotates when raising the knee of the knee bottom, the first rotating member 43, and the first rotating member 43. The interlocking link 63 that connects the two pivoting members and is capable of interlocking the pivoting of the first pivoting member 43 and the pivoting of the second pivoting member, and the portion that intersects with the interlocking link in plan view are provided. And a cross bar 53B having the same. At least one of the interlocking link 63 and the cross bar 53B has escape structures 53a and 63a which are deformed so as to avoid mutual contact at the intersecting portions. [Selection diagram] Fig. 7
