To provide a device in which a plurality of liquid substances such as reagents required for a series of manipulations on a sample are stably secured in separated states throughout the manipulations within the device. A chip device for manipulating an object component comprises: a manipulation chip 1 comprising a substrate 2, a groove 3 formed in the surface of the substrate, and a manipulation medium accommodated in the groove such that gel phases g and aqueous liquid phases l are alternately disposed in the longitudinal direction of the groove 3 and are in contact with each other; magnetic particles to capture and carry the object component; and a magnetic field application means capable of moving the magnetic particles in the longitudinal direction of the groove in the substrate by the application of a magnetic field to the substrate.