The utility model provides an indoor unit and an air conditioner, and relates to the technical field of air conditioners. The indoor unit comprises a shell, an air guide plate and a blocking piece, a first air scattering structure is arranged on a front end plate of the shell, a main air duct and an air scattering duct are arranged in the shell, a communicating opening is formed in the upper edge of a lower air outlet of the main air duct, and the air scattering duct communicates between the first air scattering structure and the communicating opening; the air deflector is connected to the shell and used for closing or opening the lower air outlet; the front baffle and the bottom baffle are connected to the rotating shaft in a linkage mode, the rotating shaft is rotationally connected to the lower edge of the front end plate and extends in the left-right direction, and when the rotating shaft rotates to the first rotating position, the front baffle covers the first air scattering structure on the front side, and the bottom baffle seals the communicating opening; and when the rotating shaft rotates to the second rotating position, the front baffle avoids the first air dispersing structure, and the bottom baffle opens the communicating opening. The air conditioner comprises an outdoor unit and the indoor unit. The first air dispersing structure in the indoor unit is not prone to being blocked by dust, and liquid is not prone to being blown outwards when an air conditioner runs in a direct blowing mode.