Provided is a microchip assembly including a base holder, a microchip installed on the base holder and having at least one input hole into which a reaction sample is input and at least one microchamber accommodating the input reaction sample, a flipper rotatably installed at the outside of the microchip on the base holder and opening and closing the input hole of the microchip while flipping up in a vertically erected state or flipping down in a horizontal state, and slider installed at the outside of the flipper on the base holder to be capable of sliding and supporting the flipper in the erected state and flipping down the flipper while moving inside.