The occurrence of a defective orientation of a polymer/liquid crystal composite is suppressed. In addition, the occurrence of defective display of a liquid crystal display device including the polymer/liquid crystal composite is suppressed. In the polymer/liquid crystal composite exhibiting a blue phase, a plurality of domains are included and defective orientations easily occur at boundaries between the domains. Thus, by lowering orientation periodicities at boundaries between the domains, a defect-free orientation to high orientation periodicities at the boundary between adjacent domains can be obtained. Specifically, the polymer/liquid crystal composite exhibiting the blue phase includes the plurality of domains each of which has a size of 3 μm or less.