The present invention relates to a body stretching bed including a base plate (220), a detection unit (340), a front upper frame (231) and a rear upper frame (241), a first crank member (320a) and a second crank member (320b), a pair of first moving shafts (360a) and second moving shafts (360b), a pair of third moving shafts (360c) and fourth moving shafts (360d), a moving panel (350), and support members (370, 370a). The base plate is mounted with a plurality of decelerators (300a, 300b). The detection unit is arranged on the base plate, and generates signals for detecting the phase of either of the decelerators (300a, 300b) and stopping the operation of a driving unit. The front upper frame and the rear upper frame are arranged outside the base plate (220) so as to form a frame of the bed. The first and second crank members are arranged at both sides of a driving shaft (305) of the decelerators (300a, 300b). The first and second moving shafts are connected to the first crank member (320a) such that the first and second moving shafts are rotatable, and arranged in the vertical direction. The third and fourth moving shafts are connected to the second crank member (320b) such that the third and fourth moving shafts are rotatable, and arranged in a vertical direction. The moving panel is mounted on the first to fourth moving shafts (360a to 360d). The support members (370, 370a) have both ends connected to the moving panel (350) and the front upper frame (231) or the rear upper frame (241) to support a matt unit (100). The matt unit (100) has a mattress (110), the center of which is tied to the moving panel (350) and the top and bottom of which are tied to a bed frame (200).