A vertical seismic isolation device, comprising: a fixed frame ; a movable frame , which allows a device subjected to seismic isolation to be placed thereon, and is arranged on the fixed frame; a support guide mechanism which allows only vertical movement of the movable frame with respect to the fixed frame; and a restoration member which is configured to urge the movable frame so as to maintain a constant distance between the movable frame and the fixed frame , the support guide mechanism is characterized by including: a track rail which is provided on the fixed frame ; a moving block , which is assembled to the track rail through intermediation of a large number of rolling elements, and is configured to bear a load which acts in a direction other than a longitudinal direction of the track rail ; a support leg , which has one end rotatably coupled to the moving block and another end rotatably coupled to the movable frame , and is configured to convert the vertical movement of the movable frame into a motion of the moving block along a longitudinal direction of the track rail ; and an auxiliary leg , which has a length set to one-half of a length of the support leg , and has one end rotatably coupled to the support leg at an intermediate position in a longitudinal direction of the support leg and another end rotatably coupled to the fixed frame . a fixed frame ; a movable frame , which allows a device subjected to seismic isolation to be placed thereon, and is arranged on the fixed frame; a support guide mechanism which allows only vertical movement of the movable frame with respect to the fixed frame; and a restoration member which is configured to urge the movable frame so as to maintain a constant distance between the movable frame and the fixed frame , the support guide mechanism is characterized by including: a track rail which is provided on the fixed frame ; a moving block , which is assembled to the track rail through intermediation of a large number of rolling elements, and is configured to bear a load which acts in a direction other than a longitudinal direction of the track rail ; a support leg , which has one end rotatably coupled to the moving block and another end rotatably coupled to the movable frame , and is configured to convert the vertical movement of the movable frame into a motion of the moving block along a longitudinal direction of the track rail ; and an auxiliary leg , which has a length set to one-half of a length of the support leg , and has one end rotatably coupled to the support leg at an intermediate position in a longitudinal direction of the support leg and another end rotatably coupled to the fixed frame . a track rail which is provided on the fixed frame ; a moving block , which is assembled to the track rail through intermediation of a large number of rolling elements, and is configured to bear a load which acts in a direction other than a longitudinal direction of the track rail ; a support leg , which has one end rotatably coupled to the moving block and another end rotatably coupled to the movable frame , and is configured to convert the vertical movement of the movable frame into a motion of the moving block along a longitudinal direction of the track rail ; and an auxiliary leg , which has a length set to one-half of a length of the support leg , and has one end rotatably coupled to the support leg at an intermediate position in a longitudinal direction of the support leg and another end rotatably coupled to the fixed frame . <EOS>