A suspension which includes: an upper frame and a lower frame which are supported so as to be capable of a separating and approaching operation relative to each other via a frame link mechanism; and a spring mechanism which elastically biases the upper frame, the spring mechanism comprising a combination of: a linear spring (41, 42) which biases the upper frame in a direction in which the upper frame separates from the lower frame, the linear spring (41, 42) exhibiting a linear characteristic; and a magnetic spring which includes: a stationary magnet fixedly disposed on the lower frame or the upper frame, and a movable magnet which is supported on the upper frame or the lower frame through a magnet link and whose position relative to the stationary magnet changes in accordance with the separating and approaching operation of the upper frame, the magnetic spring exhibiting a nonlinear characteristic of having a spring constant that varies according to the relative position of the stationary magnet and the movable magnet, characterized in that, in the magnetic spring,, a displacement amount of the movable magnet when the upper frame is displaced in a lower operating range which is between a neutral position and a lower limit position of the upper frame is smaller than a displacement amount of the movable magnet when the upper frame is displaced in an upper operating range which is between the neutral position and an upper limit position of the upper frame, and the magnetic spring has a softening spring characteristic that, when the upper frame makes a downward-direction relative displacement, a spring constant of the magnetic spring which acts when the upper frame is displaced in the lower operating range is smaller than a spring constant of the magnetic spring which acts when the upper frame is displaced in the upper operating range. a linear spring (41, 42) which biases the upper frame in a direction in which the upper frame separates from the lower frame, the linear spring (41, 42) exhibiting a linear characteristic; and a magnetic spring which includes: a stationary magnet fixedly disposed on the lower frame or the upper frame, and a movable magnet which is supported on the upper frame or the lower frame through a magnet link and whose position relative to the stationary magnet changes in accordance with the separating and approaching operation of the upper frame, the magnetic spring exhibiting a nonlinear characteristic of having a spring constant that varies according to the relative position of the stationary magnet and the movable magnet, characterized in that, in the magnetic spring,, a displacement amount of the movable magnet when the upper frame is displaced in a lower operating range which is between a neutral position and a lower limit position of the upper frame is smaller than a displacement amount of the movable magnet when the upper frame is displaced in an upper operating range which is between the neutral position and an upper limit position of the upper frame, and the magnetic spring has a softening spring characteristic that, when the upper frame makes a downward-direction relative displacement, a spring constant of the magnetic spring which acts when the upper frame is displaced in the lower operating range is smaller than a spring constant of the magnetic spring which acts when the upper frame is displaced in the upper operating range.