Disclosed is a window type air conditioner, comprising a base plate (100) and a fresh air device (400). The fresh air device (400) is installed on the base plate (100) and is configured to convey fresh air indoors. The fresh air device (400) comprises a fresh air shell (410) extending from the outdoors to the indoors, wherein the fresh air shell (410) is provided with a fresh air inlet (411) which is in communication with the outdoors, a fresh air outlet (412) which is in communication with the indoors, and a fresh air channel (413) enabling the fresh air inlet (411) to be in communication with the fresh air outlet (412); the fresh air shell (410) is provided with an air intake section (415) adjacent to the fresh air inlet (412), an air output section (414) adjacent to the fresh air outlet (412), and a transition section (416) arranged between the air intake section (415) and the air output section (414); and the maximum area of ventilation of the transition section (416) is at least the maximum ventilation area of the air inlet section (415) and the air outlet section (414), such that the lowest flow rate of air at the transition section (416) does not exceed the flow rate of air at the two ends of the transition section (416).
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