Image forming apparatus

An image forming apparatus comprising:

• a housing including a first wall portion extending in a vertical direction, a second wall portion extending in the vertical direction on a side opposite from the first wall portion, and an internal space formed between the first wall portion and the second wall portion;
• an image forming portion that is disposed in the internal space and forms an image on a sheet;
• a sheet cassette that is inserted from the first wall portion into the internal space in an insertion direction intersecting the first wall portion, is attached to the housing in a protruding manner from the second wall portion to the outside of the housing, is open at a top thereof, and accommodates the sheet therein;
• an opening portion that is formed in the second wall portion and through which the sheet cassette passes;
• and
• a cover member that, in a first state in which the sheet cassette is not attached to the housing, seals the opening portion and forms part of the second wall portion, and, in a second state in which the sheet cassette is attached to the housing, is pivoted by being abutted by part of the sheet cassette and covers a top of a portion of the sheet cassette that is exposed to the outside of the housing.