To easily adjust the supporting position of a sliding body in the direction perpendicular to the sliding direction while smoothly moving the sliding body.

This supporting device comprises the sliding body 2 so combined with a storage body 1 as to enable an access through an access opening 10 of the storage body 1, a supporting member 30 installed on one side of the storage body 1 and supporting a ridge 23 formed on the other and continuous in the sliding direction of the sliding body 2, and an adjusting means 31 capable of moving and adjusting the support position of the support member 30 in the Y-direction perpendicular to the X-direction when the sliding direction is set in the X-direction.