To provide a heat-peelable pressure-sensitive adhesive sheet which, even when applied to a flexible adherend or extremely small adherend, enables the adherend to be efficiently peeled and recovered therefrom without breakage.The heat-peelable pressure-sensitive adhesive sheet includes a substrate, and arranged on one side thereof in the following order, an intermediate layer having a thickness “A”, and a heat-peelable pressure-sensitive adhesive layer having a thickness “B” and containing heat-expandable microspheres with a largest particle diameter “C”. The parameters A, B, and C satisfy the following conditions: C≦(A+B)≦60 (μm) and 0.25C≦B≦0.8C, and the heat-peelable pressure-sensitive-adhesive layer, when subjected to a heating treatment, shows an adhesive strength of less than 0.1 N/20 mm after the heating treatment. The heat-peelable pressure-sensitive adhesive layer after the heating treatment preferably has an arithmetic mean surface roughness Ra of 5 μm or smaller and a maximum height of the profile Rmax of 25 μm or smaller. The substrate preferably has a glass transition temperature (Tg) of 60° C. or higher and a thickness of 50 μm or smaller.