An apparatus has a holder member which holds a sample, and a removing beam source which irradiates an inert ion beam onto a cross section of the sample held by a holder member and removes a fracture layer on the cross section. A concave portion is formed on the surface of the flange that faces the component on which the flange is fitted. The peak value and the waveform correlation coefficient are normalized, and a detection distribution is created using the obtained normalized data values. Thus, the buffer spaces of the elastic helical body provide a cushioning effect. The dosage form can be administered at night and drug release is delayed for from 5 to 8 hours or longer, followed by a prolonged release.