A crane, comprising: a three-dimensional information obtaining section which is a laser scanner provided on a boom of the crane and configured to obtain point group data represented as three-dimensional coordinate values of an object as three-dimensional information by irradiating of a monitoring area which is a part of an operation area of the crane with laser light and calculating a measured distance to the object from a time period in which the laser light is reflected by the object and travels back; and a control apparatus configured to sequentially accumulate the three-dimensional information obtained by the three-dimensional information obtaining section, and create a 3D map of the operation area based on the accumulated three-dimensional information; characterized in that the monitoring area is composed of a measurement direction and a measurement range of the three-dimensional information obtaining section, the three-dimensional information obtaining section is configured to be capable of accumulating the obtained three-dimensional information and changing the measurement direction, the measurement range and a measurement density, the control apparatus is configured to, while an operation signal of the crane is not detected, cause the three-dimensional information acquisition section to obtain the three-dimensional information under a first measurement condition, and, when the operation signal of the crane is detected, cause the three-dimensional information acquisition section to obtain the three-dimensional information under a second measurement condition that the measurement density is higher than the first measurement condition, and the control apparatus is configured to densify the accumulated three-dimensional information by superimposing the three-dimensional information acquired in the case where the operation signal of the crane is detected on the three-dimensional information acquired in the case where the operation signal of the crane is not detected. a three-dimensional information obtaining section which is a laser scanner provided on a boom of the crane and configured to obtain point group data represented as three-dimensional coordinate values of an object as three-dimensional information by irradiating of a monitoring area which is a part of an operation area of the crane with laser light and calculating a measured distance to the object from a time period in which the laser light is reflected by the object and travels back; and a control apparatus configured to sequentially accumulate the three-dimensional information obtained by the three-dimensional information obtaining section, and create a 3D map of the operation area based on the accumulated three-dimensional information; characterized in that the monitoring area is composed of a measurement direction and a measurement range of the three-dimensional information obtaining section, the three-dimensional information obtaining section is configured to be capable of accumulating the obtained three-dimensional information and changing the measurement direction, the measurement range and a measurement density, the control apparatus is configured to, while an operation signal of the crane is not detected, cause the three-dimensional information acquisition section to obtain the three-dimensional information under a first measurement condition, and, when the operation signal of the crane is detected, cause the three-dimensional information acquisition section to obtain the three-dimensional information under a second measurement condition that the measurement density is higher than the first measurement condition, and the control apparatus is configured to densify the accumulated three-dimensional information by superimposing the three-dimensional information acquired in the case where the operation signal of the crane is detected on the three-dimensional information acquired in the case where the operation signal of the crane is not detected.