This vehicle LED lamp lighting circuit controls lighting of an LED lamp mounted on a vehicle and is provided with: a first resistor which has one end connected to a power supply line for feeding power supply voltage and has the other end connected to a first contact; a first LED lamp which is formed of at least one first LED element and which has one end connected to a reference node and has the other end connected to a second contact and a grounded ground wire; and a switching device exposed to water which switches between a first state where the reference node and the first contact have electrical continuity and a second state where the reference node and the second contact have electrical continuity.
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