PROBLEM TO BE SOLVED: To provide a bookshelf provided with a book front-aligning device and a book front-aligning device capable of more easily aligning spine covers of a plurality of books having different depth dimensions. SOLUTION: This is a book front aligning device 1 for aligning the positions of spine A1 of a plurality of books A displayed on a shelf board 3 of a bookshelf 2, and has a predetermined length in the width direction of the shelf board 3. A sliding member 9 that can move in parallel on the shelf board 3 in the depth direction and a sliding member 9 that is arranged behind the sliding member 9 at an arbitrary position in the depth direction of the shelf board 3 and the sliding member 9 of the shelf board 3. The extrusion member 17 that is slidable in the depth direction and the front part of the bookshelf 2 have a predetermined length in the width direction of the shelf board 3, and the spine A1 of the book A comes into contact with and moves when the front of the book A is aligned. It is provided with a blocking member 8 capable of stopping. [Selection diagram] FIG. 8
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