PURPOSE: A rotation inspection device capable of practicing a water vein detecting process is provided to determine whether there is an error of the water vein rod by moving an operation magnetic body to a fixing magnetic direction by magnetic force. CONSTITUTION: A rotation inspection apparatus for the bar by water vein detection is operation magnet(2) and a main body(3). The operation magnet is connected it is detachable in the end part of the third expansion member. In the single-side of the operation magnet, the hall is formed. The connecting unit in which the female screw is formed in the inner circumference is fixed. The third expansion members form the male screw corresponded to the end circumference to the female screw. The main body contains a bracket and a fixing magnet.
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