A crane comprising: a telescopic boom that is capable of being extended; an extension device for extending the telescopic boom; a hydraulic pressure source (601, 602A) provided in the extension device; a cylinder connection mechanism connected to the hydraulic pressure source (601, 602A) and switching between states of connection and non-connection with the telescopic boom based on supply and discharge of hydraulic oil; a first oil path for connecting the hydraulic pressure source (601, 602A) and the cylinder connection mechanism; a first valve (604, 604B) that is provided on the first oil path and switches a supply and discharge state of the hydraulic oil with respect to the cylinder connection mechanism; and a second oil path (L7, L17, L18) that bypasses the first valve (604, 604B) and connects the hydraulic pressure source (601, 602A) and the cylinder connection mechanism, characterized in that: the crane further comprises a second valve (603A, 613) that is capable of switching between a state in which the hydraulic pressure source (601, 602A) and the cylinder connection mechanism are communicated through the first oil path and a state in which the hydraulic pressure source (601, 602A) and the cylinder connection mechanism are communicated via the second oil path (L7, L17, L18); a third valve that is capable of switching between a state in which a pilot pressure is supplied to the second valve (603A, 613) and a state in which the pilot pressure is not supplied to the second valve (603A, 613) in response to the energization, wherein when the third valve switches to the state in which the pilot pressure is not supplied, the second valve (603A, 613) becomes a state in which the hydraulic pressure source (601, 602A) and the cylinder connection mechanism are communicated through the second oil path (L7, L17, L18). a telescopic boom that is capable of being extended; an extension device for extending the telescopic boom; a hydraulic pressure source (601, 602A) provided in the extension device; a cylinder connection mechanism connected to the hydraulic pressure source (601, 602A) and switching between states of connection and non-connection with the telescopic boom based on supply and discharge of hydraulic oil; a first oil path for connecting the hydraulic pressure source (601, 602A) and the cylinder connection mechanism; a first valve (604, 604B) that is provided on the first oil path and switches a supply and discharge state of the hydraulic oil with respect to the cylinder connection mechanism; and a second oil path (L7, L17, L18) that bypasses the first valve (604, 604B) and connects the hydraulic pressure source (601, 602A) and the cylinder connection mechanism, characterized in that: the crane further comprises a second valve (603A, 613) that is capable of switching between a state in which the hydraulic pressure source (601, 602A) and the cylinder connection mechanism are communicated through the first oil path and a state in which the hydraulic pressure source (601, 602A) and the cylinder connection mechanism are communicated via the second oil path (L7, L17, L18); a third valve that is capable of switching between a state in which a pilot pressure is supplied to the second valve (603A, 613) and a state in which the pilot pressure is not supplied to the second valve (603A, 613) in response to the energization, wherein when the third valve switches to the state in which the pilot pressure is not supplied, the second valve (603A, 613) becomes a state in which the hydraulic pressure source (601, 602A) and the cylinder connection mechanism are communicated through the second oil path (L7, L17, L18). the crane further comprises a second valve (603A, 613) that is capable of switching between a state in which the hydraulic pressure source (601, 602A) and the cylinder connection mechanism are communicated through the first oil path and a state in which the hydraulic pressure source (601, 602A) and the cylinder connection mechanism are communicated via the second oil path (L7, L17, L18); a third valve that is capable of switching between a state in which a pilot pressure is supplied to the second valve (603A, 613) and a state in which the pilot pressure is not supplied to the second valve (603A, 613) in response to the energization, wherein when the third valve switches to the state in which the pilot pressure is not supplied, the second valve (603A, 613) becomes a state in which the hydraulic pressure source (601, 602A) and the cylinder connection mechanism are communicated through the second oil path (L7, L17, L18).