A method for manufacturing a fine hollow protruding article (1) according to the invention involves: a protrusion forming step of bringing a projecting mold part (11) that includes a heating means into contact from one surface (2D) side of a base sheet (2) including a thermoplastic resin, and, while softening, with heat, a contact section (TP) in the base sheet (2) where the projecting mold part (11) contacts the base sheet (2), inserting the projecting mold part (11) into the base sheet (2), to form a protrusion (3) that protrudes from the other surface (2U) side of the base sheet (2)； a cooling step of cooling the protrusion (3) in a state where the projecting mold part (11) is inserted in an interior of the protrusion (3)； and a release step of withdrawing the projecting mold part (11) from the interior of the protrusion (3) after the cooling step, to form the fine hollow protruding article (1).
