An adhesive sheet which comprises a sheet-like base and a heat-sensitive adhesive layer is provided as an adhesive sheet that can be appropriately bonded to a soft vinyl chloride resin article, which is an object to be bonded, even if the adhesive sheet is heat-sealed at a low temperature, and that is suppressed in lifting or separation of the adhesive sheet or in leakage of the adhesive from an end portion of the adhesive sheet even if an autoclave treatment is carried out on the article to which the sheet is bonded. The heat-sensitive adhesive layer is formed using a heat-sensitive adhesive composition that contains a polyester resin and a crosslinking agent, and the heat-sensitive adhesive layer contains a crosslinked structure that is based on these components. The polyester resin contains an amorphous polyester resin having a glass transition temperature of from -30�C to 7�C (inclusive) in an amount of 80 pcnt by mass or more relative to the whole polyester resin.
