Fuel supplying apparatus and fuel injecting apparatus of internal combustion engine

A fuel supplying apparatus (2-1, 2-2, 2-3, 2-4) of an internal combustion engine includes a first fuel supply system (8), a second fuel supply system (10), and a pulsation propagation suppressing unit (10d, 8b, 8c, 8d). The first fuel supply system (8) pressurizes a fuel by a low-pressure pump (7), and supplies the fuel pressurized by the low-pressure pump (7) to a first fuel injection mechanism (3). The second fuel supply system (10) is branched from the first fuel supply system (8), further pressurizes the fuel, pressurized by the low-pressure pump (7), by a high-pressure pump (9) that is driven according to an operating state of the internal combustion engine, and supplies the fuel pressurized by the high-pressure pump (9) to a second fuel injection mechanism (4). The pulsation propagation suppressing unit (10d, 8b, 8c, 8d) is provided in at least one of the first fuel supply system (8) and the second fuel supply system (10), and suppresses propagation of a pulsation generated in the high-pressure pump (9) to the first fuel injection mechanism (3).