Lens shift mechanism and projection display apparatus

A projection display apparatus comprising:

• a light source unit;
• an image formation unit that includes a plurality of optical units including an optical modulator that modulates light from the light source unit on a basis of an input image signal;
• and
• a projection unit that projects image light generated by the image formation unit,
• the projection unit including
• a projection lens,
• a cylindrical housing that holds the projection lens, and
• an operating unit that moves the cylindrical housing in one axial direction perpendicular to an optical axis of the projection lens,
• wherein the operating unit includes
• a pair of a main shaft and a countershaft extending in the one axial direction and disposed to be opposed to each other across the cylindrical housing, and
• a pair of elastic bodies provided respectively for the main shaft and the countershaft, the pair of elastic bodies being parallel to the one axial direction and having biasing directions opposite to each other.