Cooling device and image forming apparatus

A cooling device, comprising:

• a tank which accumulates a coolant;
• an attachment portion to which the tank is attached detachably;
• a pump which causes the coolant to circulate;
• a heat exchange portion which performs heat exchange between the coolant and a cooling target;
• a heat radiation portion which radiates heat of the coolant;
• a plurality of tubes which couple the tank, the pump, the heat exchange portion, and the heat radiation portion and form a circulation path of the coolant;
• a floating body which is stored in the tank together with the coolant and has a lower density than the coolant;
• a swing member which is swingably supported by the attachment portion and includes a contact portion which is displaced by being brought into contact with the tank and a to-be-detected portion which moves in an interlocking manner with the displacement of the contact portion;
• and
• a sensor which is provided in the attachment portion and detects the floating body or the to-be-detected portion present at a detection position, wherein
• the tank includes a restriction portion which restricts a movable range of the floating body under a situation where the tank is attached to the attachment portion to a range in which the detection position is set as a lower limit,
• the contact portion is displaced in accordance with attachment and detachment of the tank to/from the attachment portion, and
• by the attachment of the tank to the attachment portion, the to-be-detected portion is displaced from the detection position to an evacuation position in the interlocking manner with the displacement of the contact portion.