A power amplification device comprising: an amplifying unit provided with a plurality of groups of amplifier circuits that amplifies the power of a radio frequency, RF, signal, the plurality of groups of amplifier circuits each including a predetermined number of the amplifier circuits, wherein the amplifying unit does not include a circuit that combines RF signals; and a combining unit including first combiners and a second combiner, the first combiners being provided in association with the groups, wherein the first combiners combine RF signals output from the amplifier circuits belonging to the corresponding group and output first combined RF signals, and wherein the second combiner combines the first combined RF signals output from the respective first combiners and outputs a second combined RF signal, wherein the groups of the amplifier circuits each include at least two amplifier circuits including an amplifier circuit configured to perform a class AB operation or class B operation, and an amplifier circuit configured to perform a class C operation, each first combiner is a Doherty combiner usable for an RF signal in a specific frequency band, a housing of the amplifying unit and a housing of the combining unit are separate housings, and the amplifying unit is configured to be attachable to and detachable from the combining unit, the amplifying unit is provided with the same number of output ports as the number of amplifier circuits, and the combining unit is provided with the same number of input ports as the number of output ports of the amplifying unit, the input ports of the combining unit are arranged so as to be connected to the corresponding output ports of the amplifying unit and the housing of the amplifying unit and the housing of the combining unit have a one-to-one correspondence when the amplifying unit is attached to the combining unit. an amplifying unit provided with a plurality of groups of amplifier circuits that amplifies the power of a radio frequency, RF, signal, the plurality of groups of amplifier circuits each including a predetermined number of the amplifier circuits, wherein the amplifying unit does not include a circuit that combines RF signals; and a combining unit including first combiners and a second combiner, the first combiners being provided in association with the groups, wherein the first combiners combine RF signals output from the amplifier circuits belonging to the corresponding group and output first combined RF signals, and wherein the second combiner combines the first combined RF signals output from the respective first combiners and outputs a second combined RF signal, wherein the groups of the amplifier circuits each include at least two amplifier circuits including an amplifier circuit configured to perform a class AB operation or class B operation, and an amplifier circuit configured to perform a class C operation, each first combiner is a Doherty combiner usable for an RF signal in a specific frequency band, a housing of the amplifying unit and a housing of the combining unit are separate housings, and the amplifying unit is configured to be attachable to and detachable from the combining unit, the amplifying unit is provided with the same number of output ports as the number of amplifier circuits, and the combining unit is provided with the same number of input ports as the number of output ports of the amplifying unit, the input ports of the combining unit are arranged so as to be connected to the corresponding output ports of the amplifying unit and the housing of the amplifying unit and the housing of the combining unit have a one-to-one correspondence when the amplifying unit is attached to the combining unit.