A door suspension device (5) includes a driving-side member (21), a hanger (26), an elastic member (24), and a first adjustment bolt (38). The hanger (26) is configured so as to be displaceable in an opening/closing direction (X) in conjunction with the driving-side member (21) and supports a door (2). The elastic member (24) allows relative displacements of the driving-side member (21) and the hanger (26) by elastically deforming in accordance with a load between the driving-side member (21) and the hanger (26). The first adjustment bolt (38) is a member for adjusting an initial value of a load that acts between the driving-side member (21) and the hanger (26). The first adjustment bolt (38) includes a male screw section (38b) to be fixed to the driving-side member (21), and a head (38a) which is arranged so that an axial force acting on the first adjustment bolt (38) is received by an edge (98a) of the hanger (26).