A detection device (100) includes a holding unit (sensing plate (110), hold-down plate (120)) and a vibration detection unit (acceleration sensor (130)). The holding unit holds a container sheet (PTP sheet (200)) having a container unit (211) to contain an object to be contained (tablet (300)). The vibration detection unit detects a vibration of the holding unit. Thus, ejection of the object to be contained can be detected with a simple structure.