AFTERTREATMENT DEVICE AND ENGINE

[Problem] Provided are an aftertreatment device capable of purifying exhaust gas with a compact configuration and an engine including the aftertreatment device. [0002] [Solution] An aftertreatment device includes: a DPF case; an SCR case; an exhaust connection pipe that connects the DPF case and the SCR case; a mixer arranged at an upstream end of the exhaust connection pipe in a flow direction of exhaust gas; and a urea water injection portion that injects urea water into the mixer.