Auxiliary sheave device and crane including the same

An auxiliary sheave device provided in a crane including a derrick member capable of being derricked with a vertically rotational movement thereof and a derrick member guy line connected to a distal end portion of the derrick member in order to derrick the derrick member, the auxiliary sheave device comprising:

• an auxiliary sheave frame attached to the distal end portion of the derrick member so as to be capable of making vertically rotational movement and taking a projecting posture of projecting beyond the distal end portion of the derrick member in a derrick-member distal-end direction that is a direction from a proximal end of the derrick member toward the distal end portion thereof;
• an auxiliary sheave guy line connected to a distal side portion of the auxiliary sheave frame and to the derrick member to thereby keep the auxiliary sheave frame in the projecting posture;
• and
• an auxiliary sheave rotatably attached to the distal end portion of the auxiliary sheave frame and allowing an auxiliary hoisting rope to be applied to the auxiliary sheave.