My main interests are massive star clusters including young massive star clusters and old globular clusters. I published a paper focused on star cluster systems in M82 in 2013. Both young massive star clusters and old globular clusters are found in M82. A cluster mass function of young star clusters in M82 may show the initial cluster mass function in the starburst environment.Now I am studying globular clusters and ultracompact dwarfs in early type galaxies using various observational data including Next Generation Virgo Cluster Survey (NGVS) data.