Driving box device, indoor unit and air conditioner

The utility model provides a driving box device, an indoor unit and an air conditioner, and relates to the technical field of air conditioners. The driving box device comprises a box body, a driving gear and a transmission rack, wherein the driving gear is arranged on the box body and is meshed and matched with the transmission rack; the box body is provided with a limiting piece, at least one of the two ends, in the transmission direction of the transmission rack, of the limiting piece is provided with a limiting face used for limiting the transmission stroke of the transmission rack, and the limiting face serves as an inclined limiting face to incline away from the other end in the axial direction of the driving gear. An inclined guide face matched with the inclined limiting face is arranged at the end, corresponding to the inclined limiting face, of the transmission rack. The indoor unit comprises a shell and the driving box device, the shell is provided with an air outlet, the box body of the driving box