An operation analysis method in an operation analysis device that analyzes a dismantling operation of repeating an action of grasping a dismantling part from a dismantling target by a crusher attached to an attachment tip of a dismantling machine and an action of moving the grasped dismantling part to a sorting destination, the operation analysis method comprising: a first step of acquiring operation trajectory data in which position information, time information, and open/close information of the crusher during an operation period of the dismantling operation are recorded in time series; a second step of identifying, based on the operation trajectory data, all open points indicating positions at which the crusher is opened from a close state during the operation period and all close points indicating positions at which the crusher is closed from an open state during the operation period; a third step of calculating, as a shortest distance, a distance between each open point of the all open points and a close point nearest to the each open point, and identifying, as a sorting destination open point, an open point at which the shortest distance exceeds a first threshold value; a fourth step of identifying, based on the position information, data from when the crusher grasping the dismantling part moves to the sorting destination until it returns to the dismantling target again from among the operation trajectory data as movement data of the crusher having moved in the dismantling operation; a fifth step of identifying data in which the movement data has been removed from the operation trajectory data as grasping operation data indicating an action until the crusher grasps the dismantling part in the dismantling operation; and a step of creating analysis result data in which the dismantling operation is analyzed using the data identified in the previous steps and displaying said analysis result data by a display unit. a first step of acquiring operation trajectory data in which position information, time information, and open/close information of the crusher during an operation period of the dismantling operation are recorded in time series; a second step of identifying, based on the operation trajectory data, all open points indicating positions at which the crusher is opened from a close state during the operation period and all close points indicating positions at which the crusher is closed from an open state during the operation period; a third step of calculating, as a shortest distance, a distance between each open point of the all open points and a close point nearest to the each open point, and identifying, as a sorting destination open point, an open point at which the shortest distance exceeds a first threshold value; a fourth step of identifying, based on the position information, data from when the crusher grasping the dismantling part moves to the sorting destination until it returns to the dismantling target again from among the operation trajectory data as movement data of the crusher having moved in the dismantling operation; a fifth step of identifying data in which the movement data has been removed from the operation trajectory data as grasping operation data indicating an action until the crusher grasps the dismantling part in the dismantling operation; and a step of creating analysis result data in which the dismantling operation is analyzed using the data identified in the previous steps and displaying said analysis result data by a display unit.