Sheet conveyance apparatus and image forming apparatus

A sheet conveyance apparatus comprising:

• a first guide configured to guide a sheet;
• a second guide disposed to face the first guide, and configured to form a conveyance path together with the first guide;
• a conveyance portion configured to convey a sheet in the conveyance path;
• a pressing portion configured to press the sheet being conveyed in the conveyance path against the first guide;
• an urging portion configured to urge the pressing portion in an urging direction toward the first guide;
• a receiving member configured to hold the pressing portion and receive a reaction force of the urging portion;
• and
• a detection unit comprising a first detection portion disposed on the first guide, and a second detection portion facing the first detection portion and disposed on the second guide, the detection unit being configured to change an output value based on presence and absence of the sheet at a detection position in the conveyance path,
• wherein the second guide provided with the second detection portion, and the receiving member are movably disposed with respect to the first guide provided with the first detection portion respectively, and are configured to be positioned with respect to the first guide independently from each other.