Osteoblasts are bone-forming cells and lately osteoblastic niche is getting a lot more attention as a candidate of hematopoietic niche. Although there have been many previous studies about osteoblasts, there are few studies about the dynamics of osteoblasts. Recent rapid advance of fluorescent imaging techniques enables us to observe cellular dynamics and there are some reports that osteoblasts were visualized in live bone by using intravital two-photon microscopy. Here we show past reports about live cell imaging of osteoblasts and our latest data of live cell imaging of osteoblasts in vivo and in vitro.