MICRONEEDLE ARRAY DEVICE

PROBLEM TO BE SOLVED: To provide a microneedle array device for freely selecting the number and the pitch of microneedles and producing less molding defects.SOLUTION: The microneedle array device includes: a lower case provided with an opening and also provided with an opening for fluid supply; an upper case installed so as to close the opening of the lower case and provided with a through-hole; an internal block housed and arranged between the lower case and the upper case, provided with a microneedle array housing recess and provided with a fluid supply port and a fluid discharge port; the microneedle array housed and arranged inside the microneedle array housing recess of the internal block, respectively and provided with the microneedles; and a flow path groove provided between the lower case and the internal block. Fluid is supplied into the fluid groove through the opening for the fluid supply of the lower case and the fluid supply port of the internal block, and the supplied fluid is supplied to the respective microneedles through the fluid discharge port and the flow path groove and is injected subcutaneously through the respective microneedles.