Cleaning device and cleaning method

The invention provides a cleaning device and a cleaning method which have a small device structure and can stably perform processing such as developing on a flexographic printing plate precursor. A cleaning device that develops a flexographic printing plate precursor after image exposure using a cleaning liquid while conveying the flexographic printing plate precursor, the cleaning device being provided with: a guide that fixes both the leading end and the trailing end of the flexographic printing plate precursor; and a tension imparting unit that imparts tension to the flexographic printing plate precursor. 本发明提供一种装置结构小且能够稳定地进行对柔性印刷版原版的显影等处理的清洗装置及清洗方法。一种清洗装置，其一边输送成像曝光后的柔性印刷版原版，一边使用清洗液进行显影，所述清洗装置具有：导向器，固定柔性印刷版原版的前端及后端双方；及张力赋予部，对柔性印刷版原版赋予张力。