A sliding window for a vehicle comprising: a sliding panel (230) which is slidably attached to a vehicle body; a guide rail (310) which extends in the sliding direction of the sliding panel (230) and is integrated with the vehicle body; and a slide bracket (320) integrating a sliding part (322), which is slidably coupled to the guide rail (310), and a fixing part, which is fixed to the slide panel (230). The guide rail (310) is provided with engagement holes (500) with which clips (510) of a trim board (116) engage.