Head mounted apparatus

A head mounted apparatus mounted on a head of a user, said head mounted apparatus comprising:

• an apparatus body to be mounted on a front side of the head;
• a frame for supporting said apparatus body, said frame extending in a longitudinal direction at both sides of the head when said frame is mounted on the head;
• a front compressing portion provided on said frame or said apparatus body, and compressed against a frontal region of the head;
• first and second adjusters provided at both sides of said frame so that said first and second adjusters can move in the longitudinal direction relative to said frame;
• a back member that includes a back compressing portion compressed against an occipital region of the head, and is held by said first and second adjusters;
• and
• an interlock mechanism for enabling, as one of said first and second adjusters moves relative to said frame, the other of said first and second adjusters to move with the same moving amount relative to said frame in the same direction as the one;
• wherein each of said first and second adjusters includes a lock mechanism for locking and unlocking a unidirectional movement of said adjuster in the longitudinal direction relative to said frame, and
• wherein an unlocking direction of the lock mechanism is the same as a direction of the unidirectional movement.