Sheet feeding device

A sheet feeding device comprising:

• a document mounting board configured to have documents mounted thereon;
• a document weight detecting unit configured to detect a weight of the documents mounted on the document mounting board;
• and
• a feed mechanism configured to include a pickup roller rotating to forward the documents and to feed the document at the lowermost among the documents mounted on the document mounting board to a downstream side in a feeding direction of the documents,
• wherein the document mounting board includes
• a first member that includes a first mounting surface on which the documents are mounted and that is located on the feed mechanism side in the feeding direction of the documents in the feed mechanism, the first mounting surface being inclined to a lower side toward the feed mechanism, and
• a second member that includes a second mounting surface on which the documents are mounted and that is disposed on a side opposite to the side of the first member on which the feed mechanism is located, and
• the second member is connected to the first member to be rotatable about a turning shaft parallel to a rotation shaft of the pickup roller, and turns about the turning shaft depending on the weight of the documents detected by the document weight detecting unit to change an angle with respect to the first member.