A game adjuster includes a bottomed cylindrical body (11) and a cylindrical piston (12, 12A, 12B) which is slidably inserted in the piston (11) and has a bottom wall (17) and a peripheral wall (18). The piston has a low-pressure chamber (22). The peripheral wall (18) of the piston (12, 12A, 12B) includes an annular band portion (23) abutting an upper part of a peripheral wall (14) of the piston (11). The peripheral wall (18) of the piston (12, 12A, 12B) has a plurality of piston holes (25, 25A, 25B) located under the band portion (23). The piston oil holes (25, 25A, 25B) include respective lower ends that define a level of the oil stored in the low-pressure chamber (22). The plurality of piston oil holes (25, 25A, 25B) are located at a common height position of the circumferential wall (18) of the piston (12, 12A, 12B) close to the belt portion (23).
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