The present invention relates to a method of detecting target nucleic acid molecules in a sample. A valve port of the electromagnetic valve is connected to a connecting hole of the intake manifold via an O-ring, and a stay connected to the electromagnetic valve is coupled to a bolt via a resilient member such as a grommet. A first holding device is provided including a pair of first flexible straps configured to fix the power transmission frame relative to the rotor blade in the direction of the centrifugal force and to allow the power transmission frame to move relative to the rotor blade transversely to the direction of the centrifugal force within a limited range. The user may be a web browser or a web server, and the server may be a web server.