This is the fourth linear motor subway line to be built in Japan, opening on 3 February 2005.

Construction on a 1.6 km (0.99 mi) extension from Tenjin-Minami to Hakata station via Canal City received its final planning permissions in 2014.

[8] The extension is expected to head east from the terminus at Hakata Station and run for around 3.0 km (1.9 mi) to the international terminal at the airport.

[9] Currently, the domestic terminal at Fukuoka Airport is served by the Kūkō Line on the subway network.

[8] The line currently employs four-car long 3000 series trains purchased in 2005 for the start of revenue service.

These sets, designated as 3000A series, feature a blue and green livery and were intended for an increase in service when the Nanakuma Line was extended from Tenjin-Minami to Hakata in March 2023.