Provided is an intake noise reduction device which is less likely to impede air flow due to deformation of a flow rectifying net section, and hence, less likely to cause a decreased air flow rate. The device is characterized in that line parts that are arranged into a net to form the flow rectifying net section (120) include circumferential line parts (122) that extend in a circumferential direction, and each circumferential line part (122), when the upstream and downstream sides thereof are defined on the basis of the flow of air, has a radial width (t1) on the upstream side that is larger than the radial width (t2) on the downstream side and has a radial outer surface (122A) that is tapered toward the downstream side.