Disclosed is an expandable powdery thermoplastic polyurethane resin composition (A) comprising a powdery thermoplastic polyurethane resin (A1) and a thermal-decomposition-type powdery foaming agent (A2) compounded in the powdery thermoplastic polyurethane resin (A1). The powdery thermoplastic polyurethane resin (A1) has a volume average particle diameter of 110 to 300 μm. In the powdery thermoplastic polyurethane resin (A1), the content of particles having particle diameters of less than 100 μm is 40 mass% or less, the content of particles having particle diameters of less than 30 μm is 5 mass% or less, and the content of particles having particle diameters of less than 20 μm is 2 mass% or less. The thermal-decomposition-type powdery foaming agent (A2) has a volume average particle diameter of 20 μm or less.
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