An image display apparatus, comprising: a display panel that displays an image on a front surface; a frame that is flat plate-shaped and disposed behind the display panel; a light guide plate disposed between the frame and the display panel, the light guide plate emitting incident light toward the display panel; and a pair of support mechanisms fixed to the frame in positions at which the light guide plate is clamped at both sides that intersect a first axis perpendicular to a thickness of the light guide plate, wherein the pair of support mechanisms each include: a movable component that supports the light guide plate; a body component fixed to the frame and movably retains the movable component; an elastic member that pushes the movable component toward an opposite support mechanism; and a protrusion that is disposed on the movable component and protrudes from the body component in a direction parallel with the thickness of the light guide plate, an engagement section with which the protrusion engages is disposed on both end portions, of the light guide plate, along the first axis, the engagement section includes: a tab formed outwardly from an end surface, of the light guide plate, along the first axis; and a notch that recedes inwardly from an end surface of an outside of the tab and engages with the protrusion, wherein a root of the notch nearest the opposite support mechanism is located inward of the end surface, of the light guide plate, along the first axis. a display panel that displays an image on a front surface; a frame that is flat plate-shaped and disposed behind the display panel; a light guide plate disposed between the frame and the display panel, the light guide plate emitting incident light toward the display panel; and a pair of support mechanisms fixed to the frame in positions at which the light guide plate is clamped at both sides that intersect a first axis perpendicular to a thickness of the light guide plate, wherein the pair of support mechanisms each include: a movable component that supports the light guide plate; a body component fixed to the frame and movably retains the movable component; an elastic member that pushes the movable component toward an opposite support mechanism; and a protrusion that is disposed on the movable component and protrudes from the body component in a direction parallel with the thickness of the light guide plate, an engagement section with which the protrusion engages is disposed on both end portions, of the light guide plate, along the first axis, the engagement section includes: a tab formed outwardly from an end surface, of the light guide plate, along the first axis; and a notch that recedes inwardly from an end surface of an outside of the tab and engages with the protrusion, wherein a root of the notch nearest the opposite support mechanism is located inward of the end surface, of the light guide plate, along the first axis. a movable component that supports the light guide plate; a body component fixed to the frame and movably retains the movable component; an elastic member that pushes the movable component toward an opposite support mechanism; and a protrusion that is disposed on the movable component and protrudes from the body component in a direction parallel with the thickness of the light guide plate, an engagement section with which the protrusion engages is disposed on both end portions, of the light guide plate, along the first axis, the engagement section includes: a tab formed outwardly from an end surface, of the light guide plate, along the first axis; and a notch that recedes inwardly from an end surface of an outside of the tab and engages with the protrusion, wherein a root of the notch nearest the opposite support mechanism is located inward of the end surface, of the light guide plate, along the first axis. a tab formed outwardly from an end surface, of the light guide plate, along the first axis; and a notch that recedes inwardly from an end surface of an outside of the tab and engages with the protrusion, wherein a root of the notch nearest the opposite support mechanism is located inward of the end surface, of the light guide plate, along the first axis.