守衛

1. Origins, structure, and basic meaning

• Structure: 守衛 is read as しゅえい and is a noun for a guard or security officer who controls access to and patrols a building.
• Basic usage: Use 入口の守衛に見せる for showing something to the entrance guard and 二人の守衛が巡回する for guards on patrol.

2. Common pitfalls and similar expressions

• Person, not security equipment
  • It denotes the person checking a reservation or walking the perimeter, not a security system or security as an abstract service.
• Counting personnel
  • 二人の守衛 counts two people, while 夜間は establishes nighttime as the period for their patrol.