A syringe barrel includes an barrel main body having a female luer at a distal end of the barrel main body, the female luer being configured such that a male luer is insertable into and connectable to the female luer and a cap that is detachably attached to the female luer to close an opening of the female luer. The female luer has a female luer-side connector, and the cap is detachably attached to the female luer via the female luer-side connector. The cap includes an insertion part inserted into the female luer, a sealing part that seals the opening of the female luer, and a cap-side connector that is detachably engaged with the female luer-side connector.
