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.