Resin composition, molded article, and method for manufacturing molded article

Provided are: a resin composition having excellent fluidity, whereby a molded article having high hardness can be obtained; a molded article obtained by curing the resin composition; and a method for manufacturing a molded article. Provided is a resin composition including 10 wt% to 40 wt% of component (a), 60 wt% to 89 wt% of component (b), 1 wt% to 10 wt% of component (c), and 0.01 wt% to 5 wt% of component (d). Component (a): an unsaturated monomer (I) having at least two radical-polymerizable double bonds in each molecule thereof, or a mixture of the unsaturated monomer (I) and an unsaturated monomer (II) which is copolymerizable with the unsaturated monomer (I). Component (b): a glass filler having a median diameter of 1 µm to 20 µm. Component (c): cross-linked resin particles. Component (d): a radical polymerization initiator.