A pair of side pads, which are arranged to face each other by having a negative pressure generating part in the direction orthogonal to an air flow direction of a slider therebetween, are made to have three or more steps, respectively. The lock mechanism fastens, by the lock bolt, the pair of the side plates of the support bracket to press and fix the pair of jacket side plates of the lower jacket, and to press and fix the support flange of the upper jacket via the spacers. Each such motion layer can be further divided into different clusters, for example, based on distances between points. 4, a flexural rigidity of the outer layer is higher than the by 70 to 500 MPa, and the intermediate layer is placed such that the a radius of the golf ball, a radius of the inner core and a radius of a two-layer structured core obtained by forming the intermediate layer on the inner core satisfy the following two formulae:rIrG\u22670. A method of controlling a cooker could include the use of such a sensor to permit a cooking time period to differ depending on whether the cooked food is wrapped. There are also provided a conjugated diene polymer produced by the production method, and a polymer composition containing a rubber component that includes the conjugated diene polymer and carbon black andor silica, the total content of the carbon black and the silica being 5 to 200 parts by weight relative to 100 parts by weight of the rubber component.