PROBLEM TO BE SOLVED: To provide a method for easily detaching a microneedle array chip from an applicator.SOLUTION: Between a magnetic force response part arranged at a chip for a base for constructing a microneedle array and a magnetic force generation part arranged at an applicator, attachment is executed utilizing magnetic force. In the case of detachment from the applicator, by degaussing the magnetic force of the magnetic force generation part arranged at the applicator or physically detaching the chip for the base, the microneedle array chip can be easily detached from the applicator.