Oral title: Observations of Disks around Protostars

Oral abstract: Disks are ubiquitous around T Tauri stars, and have been intensively studied in the last two decades. Although these 
disks are considered to form around protostars, our understanding of disks around protostars, including their formation processes, 
is still poor. I will summarize observational studies of disks around protostars, with emphasis on those using ALMA.