A manufacturing method of a coil component (100) comprising the steps of: preparing a coil assembly body (10), in which a coil (15) is attached on a magnetic core (12), and a mold body (60), which is formed with a cavity portion (62) in the inside thereof and which includes at least one opening portion (70), putting a viscous admixture (50) including magnetic powders and thermosetting resin in the cavity portion (62) of the mold body (60), then placing the coil assembly body (10) on the viscous admixture (50) such that terminal portions (16) are to be exposed from the viscous admixture (50), pushing the coil assembly body (10) into the viscous admixture (50) in the mold body (60) by descending a press body (30) without rotation, the coil assembly body (10) being pushed in so as to be buried in the viscous admixture (50) except the terminal portions (16), and thermally-curing the viscous admixture (50) and forming a magnetic exterior body (20) which covers the coil assembly body (10).