A multiple oscillation-type generator includes: a first reciprocating member arranged inside a fluid and configured to reciprocate by lifting force, lowering force, or flow energy resulting from the fluid; a second reciprocating member arranged inside the fluid at a distance from the first reciprocating member and configured to reciprocate by lifting force, lowering force, or flow energy resulting from the fluid; a first conversion unit connected to the first reciprocating member and configured to convert reciprocating movements into rotational movements; a second conversion unit connected to the second reciprocating member and configured to convert reciprocating movements into rotational movements; a main power shaft configured to make rotational movements by rotational movements of the first conversion unit and the second conversion unit; and a generation unit configured to produce electric power using transferred rotational movements of the main power shaft.