A sheet conveying device includes a flap pivoting between a first state to contact a first path-defining member and a second state to be separated from a first path-defining member. The first path-defining member, which faces a second path-defining member in a facing direction, includes a guide surface for guiding a sheet conveyed along a first conveying path, a contact surface positioned farther from the second path-defining member in the facing direction than the guide surface and configured to contact the flap in the first state, and an inclined surface positioned downstream of the contact surface in a conveying direction and inclined such that an upstream end thereof in the conveying direction is closer to the second path-defining member in the facing direction than a downstream end thereof. The upstream end of the inclined surface is closer to the second path-defining member in the facing direction than the contact surface.