Image forming apparatus

An image forming apparatus comprising:

• a fixing unit;
• and
• an apparatus main body to which the fixing unit is attachably/detachably installed,
• wherein the fixing unit includes,
• a first rotating member heated by a heating source,
• a second rotating member facing to the first rotating member, and
• a fixing nip forming mechanism configured to make the second rotating member pressed to the first rotating member and to form a fixing nip between the first rotating member and second rotating member,
• the apparatus main body includes a nip pressure changing mechanism, and
• the nip pressure changing mechanism is configured to press the fixing nip forming mechanism and to change a pressure of the fixing nip,
• wherein the fixing unit further includes
• a fixing frame in which the first rotating member and second rotating member are housed,
• the fixing nip forming mechanism includes
• a pressurizing member including an engaging part configured to engage with the fixing frame, a holding part configured to hold the second rotating member, and a first spring reception and a second spring reception located on the opposite side of the engaging part across the holding part,
• a first spring installed between the first spring reception and fixing frame,
• a spring holder configured to be movable forward and backward in the directions approaching to and going away from the second spring reception, and
• a second spring installed between the second spring reception and spring holder, and
• when the nip pressure changing mechanism presses the spring holder, the spring holder moves in the direction approaching to the second spring reception, the spring holder presses the second spring reception via the second spring, and the pressurizing member turns around a side of the engaging part.