The is a bureau of the National Police Agency in charge of national-level internal security affairs.
It supervises the Security Bureau and the Public Security Bureau of the Tokyo Metropolitan Police Department, and Security departments of other Prefectural police headquarters for those issues.
The current chief of the Security Bureau is .
Organization of the Security Bureau is as follows:
The is charged with internal counter-terrorism, countering cybercrime and surveillance of potentially threatening groups, organisations, and social phenomena. It's also tasked with providing close protection requirements to VIPs.
The is charged with counter-intelligence, and international counter-terrorism. It has a unit known as YAMA, which has access to classified information based on intercepts from various communications facilities.
The replaced the former in 2019. It's mandated with security and protecting VIPs (1st Division) and response to large-scale disaster or terrorism (2nd Division).
Prospective SB officers are trained at the National Police Academy in intelligence gathering techniques.