A multi display system comprising: a plurality of video display apparatuses (1a to 1r); a support structure that supports the plurality of video display apparatuses (1a to 1r); and a position adjustment mechanism (50, 50A, 50B) capable of adjusting a position of each of the plurality of the video display apparatuses (1a to 1r), wherein the position adjustment mechanism (50, 50A, 50B) includes a joint adjustment mechanism (10, 11) responsible for position adjustment in a vertical direction and a lateral direction of each of the plurality of video display apparatuses (1a to 1r), and a level difference adjustment mechanism (15, 15A) responsible for position adjustment in a back-and-forth direction of each of the plurality of video display apparatuses (1a to 1r), the level difference adjustment mechanism (15, 15A) includes a level difference adjustment member that is rotationally operable and a positioning pin, the level difference adjustment member being disposed at each of four corner portions on a rear surface of each of the plurality of video display apparatuses (1a to 1r) and having a magnet, the positioning pin being provided coaxially with a rotational axis of the level difference adjustment member, the joint adjustment mechanism (10, 11) includes: a connecting member (6, 7, 8, 9) disposed at a position, on the support structure, corresponding to each of the four corner portions of each of the plurality of video display apparatuses (1a to 1r); a laterally movable table movable in a lateral direction on the connecting member (6, 7, 8, 9); a vertically movable table movable in a vertical direction on the laterally movable table, having a front end portion and a rear end portion, wherein a surface of the front end portion faces to a rear surface side of the plurality of video display apparatuses (1a to 1r), and a surface of the rear end portion faces away from the rear surface side of the plurality of video display apparatuses (1a to 1r); a contact portion provided at the front end portion of the vertically movable table, made of a magnet or a magnetic material, and capable of being in contact with a surface of the level difference adjustment member on a side of the positioning pin; a hole portion (19a, 32a) that is formed to extend from the contact portion towards the rear end portion of the vertically movable table and in which the positioning pin is able to be inserted; a lateral position adjustment mechanism that moves the laterally movable table and the vertically movable table in a lateral direction; a lateral position adjustment knob that is rotationally operable, the lateral position adjustment knob being connected with the lateral position adjustment mechanism and being disposed on the connecting member (6, 7, 8, 9); a vertical position adjustment mechanism that moves the vertically movable table in a vertical direction; and a vertical position adjustment knob that is rotationally operable, the vertical position adjustment knob being connected with the vertical position adjustment mechanism and being disposed on the laterally movable table, when the laterally movable table and the vertically movable table are moved in a lateral direction via the lateral position adjustment mechanism by rotational operation of the lateral position adjustment knob, each of the plurality of video display apparatuses (1a to 1r) moves in a lateral direction, and when the vertically movable table is moved in a vertical direction via the vertical position adjustment mechanism by rotational operation of the vertical position adjustment knob, each of the plurality of video display apparatuses (1a to 1r) moves in a vertical direction, and in a state where the positioning pin is inserted in the hole portion (19a, 32a), when a surface of the level difference adjustment member on a side of the positioning pin is stuck to the contact portion by a magnetic force of the magnet, each of the plurality of video display apparatuses (1a to 1r) is fixed to the support structure. a plurality of video display apparatuses (1a to 1r); a support structure that supports the plurality of video display apparatuses (1a to 1r); and a position adjustment mechanism (50, 50A, 50B) capable of adjusting a position of each of the plurality of the video display apparatuses (1a to 1r), wherein