Problem To provide an operating table that eases radiation therapy with proton beam without adversely affecting sites other than a lesion. Additionally, information on the lesion site specified by a survey instrument is usable for the radiation with proton beam as it is. Thus, the operating table ensures effective treatment with proton beam. Solution An operating table (1) includes a patient placement table (patient placement securing means) (2), a main body (3), engaging pieces (coupling means) (4, 4), and so on, and a motor (rotatable drive control means) (14). The patient placement table (2) is to place and secure a patient P in a required posture. The main body (3) supports the patient placement table (2). The engaging pieces (4, 4), and so on removably couple the patient placement table (2) to the main body (3). The motor (14) rotates the patient placement table (2) with a head-feet direction of the patient as a rotation axis to hold the patient placement table (2) at any given rotation angle. The patient placement table (2) and the main body (3) are separatable as necessary.