Patent ID: 7238325

Claim:
A micro chemical device with a valve function, in which a member (B) is bonded to a member (A) with a groove in the surface thereof, via the surface of the member (A) in which the groove is formed, a capillary type channel of width from 1 to 1000 μm and height from 1 to 1000 μm is formed by the groove of the member (A) and the member (B) at the bonding surface between the member (A) and the member (B), a cavity section is formed partway along the channel and the width of this cavity section is from 0.5 to 100 fold the width of the capillary type channel and the ratio of maximum height/maximum width for the cavity section is no more than 1, and either one of the member (A) and the member (B) is formed from a soft material with a tensile modulus of elasticity within a range from 0.1 MPa to 700 MPa, at least within the portion which corresponds with the position of the cavity section, wherein a member (H) comprising a convex structure is laminated to the outside of the member (A) or the member (B), and the convex structure is fixed in a position corresponding with the cavity section, with the convex structure facing the cavity section, and by selectively compressing the cavity section from the external surface on the member (A) side and/or the member (B) side, the volume of the cavity section can be reduced in a reversible manner.