To inhibit formation and accumulation of deposit on a cylinder direct injection fuel injection valve after cylinder direct injection fuel gets less.

A fuel supply device 50 for a various fuel internal combustion engine provided with a port injection fuel supply means 51 injecting first fuel F1 stored in a port injection fuel vessel 41A to an intake port 11b, and a cylinder direct injection fuel supply means 52 directly injecting second fuel F2 stored in a cylinder direct injection fuel vessel 41B to a combustion chamber CC, is further provided with a fuel transfer means 53 transferring the first fuel F1 in the port injection fuel vessel 41A to the cylinder direct injection fuel vessel 41B, and a fuel transfer control means (electronic control device 1) operating the fuel transfer means 53 when remaining fuel quantity in the cylinder direct injection fuel vessel 41B gets less or the remaining fuel quantity is used up.