Provided is a document reading device capable of preventing distortion or twisting occurring in a document conveying device from being transmitted to a reading carriage incorporated in the document conveying device. A document reading device includes a second reading carriage (3) provided in a document conveying unit (A) and configured to read a surface of a document different from a surface read by a first reading carriage (2), a support frame (51) having a support surface (53, 53A, 53B, 53C) that supports the second reading carriage (3), a retaining member (54, 71) that retains the second reading carriage (3) by sandwiching the same between itself and the support frame (51 ), and an elastic member (55, 55A, 55B) provided between the second reading carriage (3) and retaining member (54, 71) so as to press the second reading carriage (3) against the support frame (51). One of the support surface (53, 53A, 53B, 53C) of the support frame (51) and a supported surface of the second reading carriage (3) that is supported by the support surface (53, 53A, 53B, 53C) is formed into a curved surface. Figure 4.