The bowling ball bottle making method of the invention is characterized in that an upper neutron 25 and a lower neutron 23 are arranged on the core material forming model 21, the gateway 26 ejects the synthetic resin in molten condition out from the cavity 27, to form a core material 3 which is provided with an upper hollow part 5a that has an upside opening 7 open at the upper side, and a lower hollow part 5b that has a lower opening 11 open at the lower side; a top cover 9, a lower cover 13 and a display panle 109 are arranged on the core material 3, the protuberance 37 of the top cover 9 is inserted into the concave part 37a of the upper type 39 as the upper button stop part, and the inserting end 31a of the lower type 31 is inserted into the concave part 13a of the lower cover 13 as the lower button stop part, a clearance 28a is sustained at the circumference of the core material 3, and the core material 3 is fixed by the top-and-low direction in the cavity 28, the melt resin is ejected through the gateway 51 in the clearance 28a to form a scarifiskin part 15 which integratedly coats the top cover 9, the lower cover 13 and the core material 3 at the same time.