Provided is a heat-expansive and repeelable acrylic pressure-sensitive adhesive tape which keeps a high dry bond strength in a joined state, regardless of whether the surface of an adherend is even or uneven, and shows a lowering in the bond strength upon heating for disjoining or disjointing the bonded area to thereby facilitate the disjoining or disjointing, characterized in that the disjoining or disjointing can be easily carried out even after storing at a high temperature over a long period of time. A heat-expansive and repeelable acrylic pressure-sensitive adhesive tape or sheet which comprises at least a pressure-sensitive adhesive layer containing a heat-expansion agent, characterized by showing an initial 90o peel bond strength, measured by using a polycarbonate board as an adherend, greater than or equal to 10 N/25 mm, and, after storing for 2 months in an atmosphere at 80oC while maintaining the state of being bonded to the polycarbonate adherend and then subjecting to a heat expansion treatment, showing a 90o peel bond strength less than 10 N/25 mm.