To provide a cabin front part structure for a vehicle sufficiently securing defroster effects and providing a freedom degree of a car body design.

In an indoor front part structure for a vehicle providing a fixing pin engagement hole 2c in a bulkhead 2, inserting a fixing pin 20 provided in an instrument panel 10 in the fixing pin engagement hole 2c to position and fix the instrument panel 10, and attaching and fixing left/right both sides of the instrument panel 10 to a front pillar, a blowoff part 32 of a defroster nozzle 30 is extended along an opening 15 opened in the instrument panel 10, a blowoff port 15a is provided mated with the opening 15, and a defroster fitting part 25 in which the blowoff part 32 is fitted is formed in a base part 22 of the fixing pin 20.