Image reading device and image forming device

An image reading device comprising:

• a contact glass;
• an image reading control portion which executes fed reading for reading an image of the document passing over the contact glass while fed by a document conveying unit or stationary reading for reading an image of the document while stationary on the contact glass,
• the document conveying unit which conveys a document, the document conveying unit openable and closable mounted on the upper face of the contact glass,
• the document conveying unit including:
• a document conveying path for feeding the document onto the contact glass;
• a document set tray which is set the document to be fed onto the document conveying path;
• a document set detection portion which detects the presence or absence of the document in the document set tray;
• a document feed portion which feeds the document from the document set tray to the document conveying path;
• and
• a document feed detection portion which detects the presence or absence of the document at a document feed detection position to the downstream side in the document feed direction from the document feed portion;
• a reception portion which accepts an instruction to execute the image reading job;
• a stationary-reading document detection portion which detects whether or not the document is present on the contact glass, wherein
• the image reading control portion that, when the reception portion accepts the instruction to execute the image reading job, on a condition that the document set detection portion detects the presence of the document, performs fed reading, and on a condition that the document set detection portion detects the absence of the document and the stationary-reading document detection portion detects the presence of the document, performs stationary reading,
• once the number of successive occurrences of a document feed error during execution of the fed reading has reached a predetermined number, the image reading control portion performs stationary reading, in the event that the stationary-reading document detection portion detects the presence of the document, even when the document set detection portion detects that the document is present.