Overview and historical setting
Large Japanese fleet carrier converted from an incomplete Tosa-class battleship hull.
Kaga belongs to the history of naval aviation ships. The class was developed for Imperial Japanese Navy during the interwar period and the Second World War, and contemporary descriptions identify it as aircraft carrier. This setting matters because the design should be read against the missions, technology, and fleet organization available to that navy at the time.
Development and program
Kaga replaced the earthquake-damaged Amagi as a treaty-authorized carrier conversion candidate.
For Kaga, the documented program can be summarized as construction activity is recorded from 1920 to 1928, 1 planned, 1 ordered, 1 completed, and 0 cancelled. Those figures separate the intended program from the ships that actually reached completion, a distinction that is especially important when requirements changed during a long construction cycle.
The recorded lineage links Kaga to no explicitly identified predecessor. Lineage is treated as evidence of design relationship, not proof that equipment, protection, or operating doctrine remained unchanged from one class to the next.
Design and operational role
The technical character of Kaga is described through battleship conversion. These characteristics are most useful when connected to the missions assigned to the class, including aircraft carrier and fleet carrier; they explain what the navy expected the ships to do rather than serving as an isolated list of specifications.
Kaga should not be treated as one permanently fixed configuration. Individual members could differ during construction and later change through refits, revised weapons, new sensors, altered boats or aircraft, and changes in crew or command facilities. The class page establishes the shared baseline, while dated ship evidence is needed for any claim about a particular hull.
Ships of the class
The documented roster for Kaga contains 1 ships, and the roster is marked complete. The named members are IJN Kaga.
The roster gives Kaga a measurable production history rather than treating the class as an abstract design. Comparing the member pages can reveal construction differences, refits, transfers, renamings, losses, and preservation outcomes that a class-wide summary cannot assign safely to every ship.
Across the member records, the currently documented outcomes are 1 sunk. This summary reflects the available ship records and should be revised when stronger evidence changes an individual vessel’s status.
Service history
Kaga supported Japanese carrier doctrine development before extensive later modernization.
Service within Kaga was not necessarily uniform. Ships built to the same design could enter different theaters, receive different modernizations, or leave service under different conditions. For that reason, an operation documented for one member is not presented as a class-wide experience unless the supporting source makes that connection.
Historical significance and evidence
A second major Japanese capital-hull carrier conversion of the treaty era.
The significance of Kaga is best evaluated by comparing its intended roles, the design features selected to meet them, the number of ships actually completed, and the different outcomes recorded across the class. That approach turns the program and roster into evidence about naval priorities rather than treating the class only as a set of measurements.
The evidence used for Kaga includes Robert Gardiner (ed.), Conway's All the World's Fighting Ships, 1922–1946, Conway Maritime Press, 1980, Treaty Between the United States of America, the British Empire, France, Italy, and Japan, Limiting Naval Armament, U.S. Department of State, Office of the Historian, 1922, and KAGA aircraft carrier (1928), Navypedia. These sources support the chronology and identification presented here; where they do not establish a ship-specific event or configuration, the profile says so rather than borrowing details from another vessel.
For Kaga, the evidentiary core is strengthened by reading the program, roster, and design information together. The current structured summary includes Type: Aircraft carrier; Ships completed: 1; Ships planned: 1. Those details provide a concrete basis for comparing the class with its contemporaries while keeping later refits and individual ship careers separate from the shared design baseline.
Ships in this class
Showing 1 recorded class members.
Sources and further reading
- Conway's All the World's Fighting Ships, 1922–1946Conway Maritime Press
- Treaty Between the United States of America, the British Empire, France, Italy, and Japan, Limiting Naval Armament ↗U.S. Department of State, Office of the Historian · accessed 2026-09-18
- KAGA aircraft carrier (1928) ↗Navypedia · accessed 2026-09-18