It is believed that a garan in its early days was structured around the building dedicated to Buddha, but as the worship of Buddha's sariras began to thrive, a stupa dedicated to Buddha's sariras and a Buddha hall housing a Buddha image were separated; therefore, it is believed that the garan centered around a stupa was gradually changed to a garan centered around a Buddha hall.
初期の伽藍は、仏陀を供養する建物を中心に構成されていたが、仏舎利信仰が盛んになるにつれて、仏舎利をまつる仏塔と仏を安置する仏殿が独立分離して、仏塔を中心とする伽藍から、しだいに仏殿を中心とする伽藍へと変化したと考えられている。