A block storage device for storing an embedding block which includes an embedded biological sample and is held in a cassette to which ID data is attached in advance, the device comprising: a plurality of magazines, each magazine is suitable for accommodating a plurality of the embedding blocks to be inserted into or removed from the magazine and for accommodating the embedding blocks in a state where the embedding blocks are arranged along a vertical direction in one row; a magazine holding portion for detachably holding each of a plurality of the magazines; and a reading portion for reading the ID data, wherein the magazine holding portion includes a rotary body which is rotatable around a rotation axis extended in a vertical direction, holding mechanisms provided at multiple intervals along a circumferential direction on a circumferential wall portion in the rotary body and for detachably holding the plurality of the magazines, and a rotation drive portion for moving the plurality of the magazines held by the holding mechanism in the circumferential direction by rotating the rotary body and for positioning one of the magazines at a block extraction position, characterized in that, the reading portion is disposed adjacent to the magazine holding portion and the block extraction position faces the reading portion, wherein the magazine positioned at the block extraction position and the reading portion are movable relative to each other along the vertical direction, wherein the plurality of the holding mechanisms are movable in the vertical direction with respect to the rotary body, wherein the magazine holding portion includes a lifting mechanism for vertically moving the holding mechanism which holds the magazine positioned at the block extraction position, while the other holding mechanisms are not moved. a plurality of magazines, each magazine is suitable for accommodating a plurality of the embedding blocks to be inserted into or removed from the magazine and for accommodating the embedding blocks in a state where the embedding blocks are arranged along a vertical direction in one row; a magazine holding portion for detachably holding each of a plurality of the magazines; and a reading portion for reading the ID data, wherein the magazine holding portion includes a rotary body which is rotatable around a rotation axis extended in a vertical direction, holding mechanisms provided at multiple intervals along a circumferential direction on a circumferential wall portion in the rotary body and for detachably holding the plurality of the magazines, and a rotation drive portion for moving the plurality of the magazines held by the holding mechanism in the circumferential direction by rotating the rotary body and for positioning one of the magazines at a block extraction position, characterized in that, the reading portion is disposed adjacent to the magazine holding portion and the block extraction position faces the reading portion, wherein the magazine positioned at the block extraction position and the reading portion are movable relative to each other along the vertical direction, wherein the plurality of the holding mechanisms are movable in the vertical direction with respect to the rotary body, wherein the magazine holding portion includes a lifting mechanism for vertically moving the holding mechanism which holds the magazine positioned at the block extraction position, while the other holding mechanisms are not moved.