Medium feed device and image reading apparatus

A medium feed device comprising:

• a medium placement part including a placement surface configured to have placed thereon a medium to be fed;
• a pair of a first edge guide and a second edge guide that are provided at the medium placement part and that include guide surfaces that guide edges in a width direction of the medium, the width direction intersecting with a feed direction of the medium;
• and
• a restriction part configured to take a first position between the first edge guide and the second edge guide such that a position of the restriction part in a direction normal to the placement surface is a position at which the restriction part suppresses a lift of the medium from the placement surface and a position at which the restriction part suppresses separation of the edges of the medium from the guide surfaces, wherein
• the position of the restriction part at which the restriction part suppresses the lift at the first position is located on a placement surface side with respect to an intermediate position between upper ends of the guide surfaces and the placement surface,
• wherein the restriction part is configured to be switched between the first position and a second position at which the restriction part is retracted from between the first edge guide and the second edge guide, the restriction part is switched between the first position and the second position when the restriction part pivots on, as an axis, a pivot shaft provided at the first edge guide, and
• a free-end side of the restriction part reaches the second edge guide when the restriction part is switched to the first position.