A passive radiator and a speaker, comprising: a diaphragm (1), a frame (2) and at least one folding ring assembly (3). The diaphragm (1) is provided at a middle portion of the frame (2), and is connected to an inner edge of the frame (2) through the folding ring assembly (3). The folding ring assembly (3) comprises an outer folding ring (31) at an outer layer, and an inner folding ring (32) at an inner layer. The outer folding ring (31) and the inner folding ring (32) respectively protrude in opposite directions relative to a plane in which the diaphragm (1) is located. The radius of the outer folding ring (31) is greater than that of the inner folding ring (32). The passive radiator and the speaker are capable of maximizing the flexibility of the diaphragm (1) and enhancing bass, as well as providing undistorted sound while ensuring linearity under a large amplitude.
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