A vehicle body front structure is disclosed, wherein a large engine can be installed even if the entire vehicle body length is kept compact, and an impact load can be efficiently absorbed. In a vehicle body front structure (10), internal and external extension members (41, 42) protruding forward are provided to the front ends of left and right front side frames (11, 12) and the front ends of left and right upper members (13, 14) via a mounting plate (35). In the mounting plate, internal mounting parts (51) and front walls (68) of the internal extension members are inclined farther toward the front of the vehicle body nearer the center of the vehicle width direction.