To provide an accumulator fuel supply pump for forcibly feeding high pressure fuel while suppressing an increase in the amplitude of stress which is generated in a pressure chamber, and to provide an accumulator fuel supply device equipped therewith for actualizing higher rail pressure than conventional ones.

The accumulator fuel supply device is provided for pressurizing fuel, forcibly feeding the fuel to a common rail to which a fuel injection part of an internal combustion engine is connected, and supplying the fuel through the fuel injection part to the internal combustion engine. It includes a low pressure forcible feed part for forcibly feeding the fuel from a fuel tank, and a high pressure forcible feed part for pressurizing the fuel forcibly fed from the low pressure forcible feed part and forcibly feeding it to the common rail. The high pressure forcible feed part has a plurality of pressure portions connected in series to one another for pressurizing the fuel stepwise up to target pressure.

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