A holding device for holding a HDD includes two elastic members and two frame members. The HDD includes a first end and a second end. The two elastic members are configured for respectively encasing the first end and the second end. Each frame member includes a base portion, a first sidewall, a second sidewall, and at least one pair of clamping portions. The base portion includes a first surface and a second surface opposite to the first surface. The first and second sidewalls extend from two opposite ends of the base portion. The first sidewall, the second sidewall, and the first surface cooperatively define a groove for receiving a corresponding one of the two elastic members. The clamping portions in each pair of clamping portion extends out from the first sidewall and the second sidewall and configured for engaging with a corresponding pair of clamping portions of another frame member.