A method of producing an article with a foamed surface which includes: a step 1 of forming small pores in a surface of a base made of a plastic to produce a base with small pores; a step 2 of immersing the base with small pores, obtained in step 1, in a solution including a foaming agent to prepare a foaming agent-including base; a step 3 of immersing the foaming agent-including base, obtained in step 2, in a foaming solution that makes the plastic swell and the foaming agent foam to prepare a foamed base; and a step 4 of immersing the foamed base, obtained in step 3, in a coagulating solution that coagulates the swollen plastic.