The purpose of the present invention is to provide a thermoplastic resin foam and a foam sealant that enable indentations to be sufficiently and rapidly restored. The thermoplastic resin foam is characterized in that the indentation recovery rate defined below is at least 50%, and the foam sealant is characterized by containing the thermoplastic resin foam (in particular, it is preferable an adhesive layer positioned on one or both sides of the thermoplastic resin foam be provided). Indentation recovery rate: After compressing the thermoplastic resin foam at 23°C with a jig having a 90 degree blade angle to the lowest point in the thickness direction of the foam for 15 seconds, and then releasing the compressed state, the indentation recovery rate is the ratio of the thickness of the indented portion with respect to the initial thickness 60 seconds after the compressed state has been released.
