To lock a treatment arm in an advanced position depending upon the place of massage.
A massage unit 2 carries thereon a treatment arm 6 with treatment fingers 63 and 64 at the upper and lower ends via a swing arm 5, and a locking means 7 for fixing the upper treatment finger 63 in an advanced position relative to the treatment arm 6. The locking means 7 includes a lock lever 71 arranged on the swing arm 5 for engagement with and disengagement from an engaging portion 68 of the treatment arm 6. The lock lever 71 is related to an engaging and disengaging means 8 for locking and unlocking the treatment arm 6.
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