The present invention relates to a rainwater sensing device for a vehicle. The rainwater sensing device for a vehicle comprises: a rainwater receiving part which is formed in one side of a vehicle and guides the rainwater flowing on the surface of the vehicle to a channel of a rain sensor; the rain sensor which has the channel where the rainwater flowing from the rainwater receiving part flows and measures the flow rate of the rainwater passing through the channel; and a control part which operates a wiper by detecting the information with respect to the flow rate of the rainwater from the rain sensor. Thus, the present invention controls the speed of the wiper according to the amount of rainwater, operates the wiper even in case of a little rain by sensing the rainwater, and improves the durability of the sensor.
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