Entry into a building such as a library or museum; the act of entering (often used in phrases like 'entry fee' or 'entry procedures').
当館は入館無料ですが、展示室への入場は有料です。
Entry to this facility is free, but access to the exhibition hall is charged.
入館の際は受付で身分証を提示してください。
Please present your ID at reception when entering.
社員はIDカードで入館できるが、外部の人は手続きが必要だ。
Employees can enter with their ID cards, but outsiders need to complete procedures.