Droplet observation device and droplet observation method

The invention provides a droplet observation device and a droplet observation method. The droplet observation device (200) is provided with: a measurement unit (251) that measures, on the basis of an image of a droplet, a first size (L1) that is the size of an elongated section (104) of the droplet (101) and that is the size of the droplet (101) in the direction of movement, and a second size (L2) that is the size of a thin section (105) which is the site of the elongated section (104) and which is the site where the the size in the direction perpendicular to the direction of movement is shorter than that of other parts of the elongated section (104); and a determination unit (252) that determines, on the basis of the measured first size (L1) and second size (L2), whether or not mist (103) caused by the droplet (101) will occur. 本公开提供一种液滴观察装置以及液滴观察方法。液滴观察装置(200)具备：测定部(251)，基于液滴的图像来测定第一尺寸(L1)和第二尺寸(L2)，该第一尺寸(L1)是所述液滴(101)的伸长部(104)的尺寸且是所述液滴(101)的移动方向的尺寸，该第二尺寸(L2)是细状部(105)的所述移动方向的尺寸，细状部(105)是所述伸长部(104)的部位，并且是与所述移