A safety hook being equipped with: a hook part; a closing-off body supported by the hook part so as to be capable of swinging about a first shaft, the closing-off body coming into contact with a hook-part distal-end part, which is the distal-end part of the hook part, when located at an closing-off position, and separating from the hook-part distal-end part to open an entrance of the hook part when located at an open position; and a first urging member for urging the closing-off body from the open position toward the closing-off position; the closing-off body comprising: a closing-off-body base part, which is a portion supported by the hook part; a first arm part capable of opening and closing the entrance of the hook part, the first arm part extending from the closing-off-body base part; and a second arm part extending from the closing-off-body base part, the second arm part extending along a direction different from the direction along which the first arm part extends; the second arm part comprising a closing-off-body operation part for causing the closing-off body to move from the closing-off position to the open position and a bent part which is provided to the second arm part such that the position of the closing-off-body operation part approaches a hook-part base part; the closing-off-body operation part being arranged on an opposite side of the hook part from the entrance; the safety hook further being equipped with a lock member for securing the closing-off body in the closing-off position; the lock member comprising a lock-member operation part for operating the lock member, operation of the lock-member operation part making it possible to unlock the lock member from the closing-off body; and the lock-member operation part being arranged on the same side of the hook part as is the closing-off-body operation part; and the lock-member operation part being arranged further away from the hook-part base part than is the closing-off-body operation part. a hook part; a closing-off body supported by the hook part so as to be capable of swinging about a first shaft, the closing-off body coming into contact with a hook-part distal-end part, which is the distal-end part of the hook part, when located at an closing-off position, and separating from the hook-part distal-end part to open an entrance of the hook part when located at an open position; and a first urging member for urging the closing-off body from the open position toward the closing-off position; the closing-off body comprising: a closing-off-body base part, which is a portion supported by the hook part; a first arm part capable of opening and closing the entrance of the hook part, the first arm part extending from the closing-off-body base part; and a second arm part extending from the closing-off-body base part, the second arm part extending along a direction different from the direction along which the first arm part extends; the second arm part comprising a closing-off-body operation part for causing the closing-off body to move from the closing-off position to the open position and a bent part which is provided to the second arm part such that the position of the closing-off-body operation part approaches a hook-part base part; the closing-off-body operation part being arranged on an opposite side of the hook part from the entrance; the safety hook further being equipped with a lock member for securing the closing-off body in the closing-off position; the lock member comprising a lock-member operation part for operating the lock member, operation of the lock-member operation part making it possible to unlock the lock member from the closing-off body; and the lock-member operation part being arranged on the same side of the hook part as is the closing-off-body operation part; and the lock-member operation part being arranged further away from the hook-part base part than is the closing-off-body operation part. a closing-off-body base part, which is a portion supported by the hook part; a first arm part capable of opening and closing the entrance of the hook part, the first arm part extending from the closing-off-body base part; and a second arm part extending from the closing-off-body base part, the second arm part extending along a direction different from the direction along which the first arm part extends; the second arm part comprising a closing-off-body operation part for causing the closing-off body to move from the closing-off position to the open position and a bent part which is provided to the second arm part such that the position of the closing-off-body operation part approaches a hook-part base part; the closing-off-body operation part being arranged on an opposite side of the hook part from the entrance; the safety hook further being equipped with a lock member for securing the closing-off body in the closing-off position; the lock member comprising a lock-member operation part for operating the lock member, operation of the lock-member operation part making it possible to unlock the lock member from the closing-off body; and the lock-member operation part being arranged on the same side of the hook part as is the closing-off-body operation part; and the lock-member operation part being arranged further away from the hook-part base part than is the closing-off-body operation part.