Connection angle detection device for connected vehicle, connected vehicle, and connection angle detection method for connected vehicle

The connection angle detection devices (30A-30D) acquire shape information of target members (40-1 to 40-6) of a predetermined shape provided in the first vehicle (3, 2) by means of a shape information acquisition device (20) provided in the second vehicle (2, 3), and determine a connection angle between the target members (40-1 to 40-6) on the basis of the acquired shape information of the target members (40-1 to 40-6). An angle formed by a direction determined on the basis of a predetermined condition and the front-rear direction of the vehicle body of the second vehicle (2, 3) that is held is detected as a connection angle between the first vehicle (3, 2) and the second vehicle (2, 3). The target members (40-1 to 40-6) are provided to the first vehicle (3, 2) such that the specified direction coincides with the front-rear direction of the vehicle body of the first vehicle (3, 2). 连结角检测装置(30A～30D)通过设置于第二车辆(2、3)的形状信息取得装置(20)，取得设置于第一车辆(3、2)的规定形状的目标部件(40-1～40-6)的形状信息，将根据所取得的所述目标部件(40-1～40-6)的所述形状信息，基于规定的条件确定的方