A capillary cavity 19 and an inlet 13 protruding circumferentially outward from an axial center 107 are connected by a guide section 17 formed so as to extend circumferentially inward and on which a capillary force acts. A sample liquid collected from a leading end of the inlet 13 is transferred to a separation cavity 23. A bent section 22 and a recess 21 are formed at a connected section of the guide section 17 and the capillary cavity 19 so as to change the direction of a passage.
