A dog clutch for an automated transmission includes a rotary shaft rotatably connecting to one of an input shaft and an output shaft of the automated transmission, a clutch ring rotatably supported by the rotary shaft and rotatably connecting to the other of the input shaft and the output shaft, a clutch hub fixed to the rotary shaft, a sleeve including first teeth and second teeth, an axial driving device moving the sleeve, and a dog clutch portion arranged at the clutch ring, the dog clutch portion including: clutch forward teeth each having an engagement portion contactable with each of the first teeth, and inclined surfaces extending from the engagement portion toward both sides in a circumferential direction and inclined toward a rear end position of the dog clutch portion; and a clutch rearward tooth portion engageable with the second teeth and including clutch rearward teeth.