Optical disc recording/reproducing method, optical disc and optical disc device

An optical disc recording/reproducing method, an optical disc and an optical disc device in which a logical format which has enabled long interleaving is constituted by a large block to enable data recording/reproduction to high reliability. Data is recorded/reproduced in accordance with a disc format in which an ECC block formed by a first error correction code C1 interleaved with respect to the direction of data on the disc and a second code C2 having the direction of the data different from that of the first error correction code is made up of one or more sectors and in which an information word portion of the first error correction code in the ECC block is made up of the interleaved second code.