Provided is a linear motion mechanism having a further enhanced strength of a structure.
The linear motion mechanism including an intermediate link including a conversion mechanism that converts a rotational force from a motor into a driving force in a linear direction, the intermediate link extending in the linear direction, a first link that linearly moves toward a first side in the linear direction from an end of the intermediate link on the first side on the basis of the driving force in the linear direction, and a second link that linearly moves toward a second side opposite to the first side from an end of the intermediate link on the second side on the basis of the driving force in the linear direction, in which the first link and the second link linearly move symmetrically in the linear direction in conjunction with each other.