PROBLEM TO BE SOLVED: To provide a pruning device preventing occurrence of branch-biting, and capable of efficiently performing pruning operation. SOLUTION: This pruning device is such that a chain saw 67 has a pulling spring 75 which supports a branch-biting preventing member 76 in a reciprocating movable manner to a pruning direction and an opposite direction thereto, on a part of a guide bar 71 which is located on the opposite pruning direction based on a chain tooth 72, and the branch-biting preventing member 76 has an insertion part 76a which has a thickness allowing the chain tooth 72 to let into between cut surfaces of a branch to be cut, and enables a cutting action of the chain teeth 72 and an action to the pruning direction of the guide bar 71 under a condition that the insertion part 76a is sandwiched between cut surfaces of a branch during cutting. COPYRIGHT: (C)2010,JPO&INPIT
