Provided is a page turning device that is free from multiple turning or a turning mistake even when a passbook is curled. A page turning device comprises: a conveyance guide that extends on a lower side of a conveyance surface of a passbook from at least a front side to a rear side of a turning region; and turning rollers that are disposed on an upper side of the conveyance guide in the turning region and apply a turning force to the passbook existing in the turning region by rotation, wherein the conveyance guide has concave grooves extending in a direction orthogonal to a conveyance direction below the turning rollers and is provided with ribs extending in the conveyance direction of the passbook at a position away from the turning rollers of the concave grooves in an axial direction of the turning rollers, whereby the passbook is heaved up in a direction orthogonal to the conveyance direction of the passbook when a pressing force is applied from the turning rollers to the passbook.