An image forming apparatus, comprising: a photosensitive drum; an LED print head arranged along a longitudinal direction of the photosensitive drum and configured to expose the photosensitive drum with light; a door arranged on one end side of the LED print head in a longitudinal direction of the LED print head and opened and closed when performing maintenance; a support portion configured to support the LED print head so as to move the LED print head between a first position and a second position in conjunction with opening and closing movements of the door, so that the LED print head is positioned at the first position for exposing the photosensitive drum with the light under a state in which the door is closed, and the LED print head is positioned at the second position more apart from the photosensitive drum than the first position under a state in which the door is open; and a guide portion (250a; 250b) formed on the door and configured to guide a cleaning member for cleaning the LED print head toward the LED print head positioned at the second position under the state in which the door is open, characterized in that the guide portion (250a; 250b) has a contact surface configured to contact the cleaning member to regulate a movement direction of the cleaning member to a direction toward an exit surface of the LED print head so that the cleaning member is continuously held in contact with the exit surface of the LED print head, the contact surface being inclined downward in a vertical direction toward the exit surface of the LED print head as the contact surface approaches the LED print head in the longitudinal direction under the state in which the door is open. a photosensitive drum; an LED print head arranged along a longitudinal direction of the photosensitive drum and configured to expose the photosensitive drum with light; a door arranged on one end side of the LED print head in a longitudinal direction of the LED print head and opened and closed when performing maintenance; a support portion configured to support the LED print head so as to move the LED print head between a first position and a second position in conjunction with opening and closing movements of the door, so that the LED print head is positioned at the first position for exposing the photosensitive drum with the light under a state in which the door is closed, and the LED print head is positioned at the second position more apart from the photosensitive drum than the first position under a state in which the door is open; and a guide portion (250a; 250b) formed on the door and configured to guide a cleaning member for cleaning the LED print head toward the LED print head positioned at the second position under the state in which the door is open, characterized in that the guide portion (250a; 250b) has a contact surface configured to contact the cleaning member to regulate a movement direction of the cleaning member to a direction toward an exit surface of the LED print head so that the cleaning member is continuously held in contact with the exit surface of the LED print head, the contact surface being inclined downward in a vertical direction toward the exit surface of the LED print head as the contact surface approaches the LED print head in the longitudinal direction under the state in which the door is open.