Exhaust structure and injector attachment member

An injector attachment member to be used in an exhaust structure including an exhaust pipe through which exhaust gas discharged from an internal combustion engine flows, a urea water injector that ejects urea water, and a selective catalytic reduction (SCR) catalyst that is provided on a downstream side of an ejection position of the urea water inside the exhaust pipe, the injector attachment member being a member to be used for securely attaching the urea water injector to the exhaust pipe,

• wherein the injector attachment member is a cylindrical body through which a hole extends in an axial direction, and the injector attachment member is attached to the exhaust pipe such that a nozzle hole of the urea water injector is disposed at one opening portion of the injector attachment member and that another opening portion of the injector attachment member faces an inside of the exhaust pipe on an upstream side of the SCR catalyst, and
• wherein the injector attachment member is provided with, at an inner peripheral surface of the injector attachment member, a rib that changes a flow direction of the exhaust gas from the other opening portion toward the one opening portion to a flow direction from the one opening portion toward the other opening portion.