A two-dimensional code reading device 20 is provided with image pickup device 22 which receives light reflected from either of a first inclined portion 12 and a second inclined portion 13 in a direction forming an angle θ satisfying expression (1) with respect to the normal-line direction R, and light source 21 which irradiates either of the inclined portions from a direction forming an angle α satisfying expression (2) with respect to the normal-line direction R: 30°≦θ≦35°  (1) Δθ=θ−180°+α+2β  (2) where β is less than 90°, Δθ is not less than −10° but not more than 10°, and θ and α are angles in a turn direction reverse to a turn direction at which either of the inclined portions forms the angle β with respect to the normal-line direction R.