A sheet conveying device, comprising: a housing provided with a first side surface and a second side surface facing each other, and a third side surface and a fourth side surface substantially orthogonal to the first side surface and the second side surface and facing each other; an entrance port which is formed in the first side surface for receiving a sheet into the housing; an exit port which is formed in the second side surface for discharging the sheet out of the housing; and a sheet conveying path which is formed in the housing portion for conveying the sheet from the entrance port to the exit port, wherein the housing includes a first guide member having a first guide surface (51 G) constituting one guide surface of the sheet conveying path; a second guide member having a second guide surface constituting another guide surface of the sheet conveying path, the second guide surface facing the first guide surface with a predetermined distance away from the first guide surface; and a connection portion which connects the first guide member and the second guide member to be pivotally movable relative to each other on a side of the third side surface, and a gap portion is formed between the first guide member and the second guide member in a region from the connection portion on the side of the third side surface to the first side surface, the first guide member has a recess portion formed on the first guide surface (51 C) by indenting a part of the first guide surface in such a manner as to extend from the fourth side surface toward the third side surface, and an end edge of the recess portion on a side of the first side surface is located at a same position as an end edge (561 R) of the gap portion on a side of the second side surface in a sheet conveying direction, or located on an upstream side in the sheet conveying direction. a housing provided with a first side surface and a second side surface facing each other, and a third side surface and a fourth side surface substantially orthogonal to the first side surface and the second side surface and facing each other; an entrance port which is formed in the first side surface for receiving a sheet into the housing; an exit port which is formed in the second side surface for discharging the sheet out of the housing; and a sheet conveying path which is formed in the housing portion for conveying the sheet from the entrance port to the exit port, wherein the housing includes a first guide member having a first guide surface (51 G) constituting one guide surface of the sheet conveying path; a second guide member having a second guide surface constituting another guide surface of the sheet conveying path, the second guide surface facing the first guide surface with a predetermined distance away from the first guide surface; and a connection portion which connects the first guide member and the second guide member to be pivotally movable relative to each other on a side of the third side surface, and a first guide member having a first guide surface (51 G) constituting one guide surface of the sheet conveying path; a second guide member having a second guide surface constituting another guide surface of the sheet conveying path, the second guide surface facing the first guide surface with a predetermined distance away from the first guide surface; and a connection portion which connects the first guide member and the second guide member to be pivotally movable relative to each other on a side of the third side surface, and a gap portion is formed between the first guide member and the second guide member in a region from the connection portion on the side of the third side surface to the first side surface, the first guide member has a recess portion formed on the first guide surface (51 C) by indenting a part of the first guide surface in such a manner as to extend from the fourth side surface toward the third side surface, and an end edge of the recess portion on a side of the first side surface is located at a same position as an end edge (561 R) of the gap portion on a side of the second side surface in a sheet conveying direction, or located on an upstream side in the sheet conveying direction.