An IC chip (11) mounting method which mounts two or more IC chips (11) on a base (13), includes: preparing a wafer (10) by mounting a tape (30) on a face thereof, which is the reverse of the wafer (10) having a mounting surface to be attached to the base (13), and by dividing the wafer (10) into IC chips (11) by dicing while leaving the tape (30); positioning the wafer (10) to face the base (13) in such a direction that the mounting surface to be attached to the base (13) faces the base (13); sequentially pressing the IC chips (11) on the wafer (10) against the base (13) and temporarily fixing the IC chips (11) while the base (13) is being fed in a prescribed one-dimensional direction along the wafer (10) and while the wafer (10) is being moved two-dimensionally along the base (13) ; and fixing the IC chips (11) temporarily fixed on the base (13) on the base (13) by heating and pressurizing in a batch manner.