A fuel injection type carburetor for multi-cylinder internal combustion engines includes: a throttle body having a throttle bore extending substantially vertically and being connected at the bottom portion thereof to a collecting portion of an intake manifold extending substantially horizontally; a throttle valve arranged in the throttle bore, a linear injection type fuel injection valve having a fuel injection nozzle arranged in the throttle bore in an area downstream area of the throttle valve and inclined toward the downstream direction; and an atomization promoting device arranged at a position opposite to the fuel injection nozzle so as to face the nozzle. The atomization promoting device is, for instance, a high frequency oscillator or a so-called PTC heater.