Patent ID: 7536148

Claim:
An image scanning device, comprising: a device main body having means for scanning an image; an Automatic Document Feeder (ADF) which feeds an original document from a document tray via a scanning position of the device main body to a document discharge tray; an ADF frame accommodating the ADF; and a hinge member which supports a rear side of the device main body and the ADF frame in a manner that the ADF frame can be swung, wherein at least three protrusions are provided on the ADF frame and each protrusion makes contact with a corresponding concave recess in the upper surface of the device main body to carry out a positioning of the ADF frame in a height direction, at least two of the protrusions are provided on a side opposite to the side of the hinge member, and at least one of the protrusions is provided at a center of the hinge member side and is separate from the hinge member and does not contact the corresponding concave recess when the ADF frame is swung open, wherein a base part of the hinge member is mounted on the upper surface of the device main body in a manner capable of moving vertically within a prescribed range, and the at least one protrusion on the hinge member side makes contact with the corresponding concave recess in the base part of the hinge member.