ROTATING SHAFT MECHANISM AND FOLDABLE ELECTRONIC DEVICE

Disclosed is a rotating shaft mechanism (13). The rotating shaft mechanism (13) is applied to a foldable electronic device (1), has an unfolded state and a folded state, and comprises: a main shaft (100); an inner support plate (200), which is movably connected to two sides of the main shaft in a width direction; and an outer support plate (300), which is located on two sides of the main shaft in the width direction and movably connected to one side of the inner support plate away from the main shaft. A plurality of support bulges (310) are formed on the surface of one side of the outer support plate away from a foldable screen (20) of the foldable electronic device; the plurality of support bulges are located on one side of the outer support plate close to the inner support plate; the support bulges are arranged in sequence along a width direction of the outer support plate; and at least some support bulges are configured to support a flexible printed circuit board (30) which penetrates the rotating shaft me