Hot water storage tank unit, and hot water supply apparatus provided with same

The invention discloses a hot water storage tank unit, and a hot water supply apparatus provided with the same. The present invention is provided with: a hot water storage tank (4) that stores hot water and that has a hemispheric upper plate (19), a cylindrical body plate (20) that is joined to the upper plate (19), and a hemispheric lower plate (21) that is joined to the body plate (20); and a vacuum heat-insulating material (25) that is arranged around the body plate (20). Deformation of the hot water storage tank (4) can be reduced because a reinforcing part (20a) that is formed so as to protrude toward the interior of the hot water storage tank (4) is provided to the outer periphery of the body plate (20). In addition, because the reinforcing part (20a) is formed so as to have a shape that protrudes toward the inside of the hot water storage tank (4), the assemblability of the hot water storage tank (4) and the insulating material (5) is improved, and the heat insulating properties of the hot water storag