To provide a bed apparatus in which the user's posture can be easily adjusted, which can be divided into lightweight and compact sections and is easy to convey, assembly and disassemble, and has improved work efficiency and maintenance performance. The bed apparatus includes: an upper frame including a back-raising mechanism and a knee-raising mechanism; and link type lifting mechanisms for moving up and down the upper frame, and is constructed such that the link type lifting mechanisms are arranged under the upper frame on the head side and on the foot side, respectively, a connection frame that integrally joins the link type lifting mechanisms to one another, is arranged between the head-side link type lifting mechanism and the foot-side link type lifting mechanism, and the operations of the back-raising mechanism and knee-raising mechanism, the head-side link type lifting mechanisms can be controlled individually or in cooperation.