Keggin-type polyoxometalate clusters were successfully hybridized with a polymerizable ionic-liquid having methacryloyl group and imidazolium moieties (denoted as MAImC1). Metatungstate ([H2W12O40]6−, H2W12) and dodecamolybdophosphate ([PMo12O40]3−, PMo12) anions were firstly employed to obtain inorganic-organic hybrid crystals. Their compositions and structures were clearly revealed by single crystal structure analyses.