There is provided a gel-forming device including a housing providing an inner space and having one opened side, a support plate disposed on one opened side of the housing and including at least one through-hole passing through the top and the bottom thereof, a substrate disposed on the top of the support plate and including at least one protrusion protruding from one surface thereof so as to have a biomaterial disposed thereon, and a spacing member provided on the bottom of the support plate so as to allow the support plate and the housing to be spaced apart from each other by a predetermined interval.