A vehicle suspension device, comprising: an absorber; an outer cylinder having the absorber built therein; a coil spring comprising end turn portions at both ends thereof, that are flat and do not function as a spring, and a spring portion between the end turn portions; a spring seat on which the coil spring is mounted, the spring seat being provided on an outer circumference of the outer cylinder; an upper support for holding the coil spring between the upper support and the spring seat; and a support member (6,7), characterized in that: the spring seat has a hole; the support member (6, 7) comprises: a mount which is a flat plate having a doughnut shape and is interposed between the coil spring and the spring seat; and a support section which is integrally formed on the mount and includes a head portion, a plate member, and a shaft portion, the support section has such a structure that: during assembly, the head portion is inserted into the hole, and the plate member is not deformed by the weight of the coil spring itself to engage with an edge portion of the hole so that the shaft portion is not fitted into the hole and the mount is held in contact with the spring portion and the end turn portion on a spring seat side so as to lift a part of the mount from the spring seat to ensure a state in which a center axis of the coil spring and the center axis of the absorber are substantially aligned with each other, the plate member is deformed by a compression load during assembling the upper support to pass through the hole so that the shaft portion is fitted into the hole, and during usage state, the mount is held in contact with the end portion of the coil spring on the spring seat side but is not held in contact with the spring portion of the coil spring, so that the center axis of the coil spring is arranged coaxially with the center axis of the absorber and a load axis of the coil spring is inclined with respect to the center axis of the absorber. an absorber; an outer cylinder having the absorber built therein; a coil spring comprising end turn portions at both ends thereof, that are flat and do not function as a spring, and a spring portion between the end turn portions; a spring seat on which the coil spring is mounted, the spring seat being provided on an outer circumference of the outer cylinder; an upper support for holding the coil spring between the upper support and the spring seat; and a support member (6,7), characterized in that: the spring seat has a hole; the support member (6, 7) comprises: a mount which is a flat plate having a doughnut shape and is interposed between the coil spring and the spring seat; and a support section which is integrally formed on the mount and includes a head portion, a plate member, and a shaft portion, a mount which is a flat plate having a doughnut shape and is interposed between the coil spring and the spring seat; and a support section which is integrally formed on the mount and includes a head portion, a plate member, and a shaft portion, the support section has such a structure that: during assembly, the head portion is inserted into the hole, and the plate member is not deformed by the weight of the coil spring itself to engage with an edge portion of the hole so that the shaft portion is not fitted into the hole and the mount is held in contact with the spring portion and the end turn portion on a spring seat side so as to lift a part of the mount from the spring seat to ensure a state in which a center axis of the coil spring and the center axis of the absorber are substantially aligned with each other, the plate member is deformed by a compression load during assembling the upper support to pass through the hole so that the shaft portion is fitted into the hole, and during usage state, the mount is held in contact with the end portion of the coil spring on the spring seat side but is not held in contact with the spring portion of the coil spring, so that the center axis of the coil spring is arranged coaxially with the center axis of the absorber and a load axis of the coil spring is inclined with respect to the center axis of the absorber. during assembly, the head portion is inserted into the hole, and the plate member is not deformed by the weight of the coil spring itself to engage with an edge portion of the hole so that the shaft portion is not fitted into the hole and the mount is held in contact with the spring portion and the end turn portion on a spring seat side so as to lift a part of the mount from the spring seat to ensure a state in which a center axis of the coil spring and the center axis of the absorber are substantially aligned with each other, the plate member is deformed by a compression load during assembling the upper support to pass through the hole so that the shaft portion is fitted into the hole, and during usage state, the mount is held in contact with the end portion of the coil spring on the spring seat side but is not held in contact with the spring portion of the coil spring, so that the center axis of the coil spring is arranged coaxially with the center axis of the absorber and a load axis of the coil spring is inclined with respect to the center axis of the absorber.