A measuring device configured to be installed in a moving object, the measuring device comprising: a measuring unit that performs a scan by emitting an electromagnetic wave and receiving the electromagnetic wave reflected by a reflection object; and a control unit that controls the measuring unit, wherein the control unit is configured to determine whether or not a speed of the moving object is equal to or higher than a predetermined speed, and wherein the control unit determines a scan range in a second scan to be performed after a first scan based on a received signal of the measuring unit at the first scan by the measuring unit when it is determined that the speed of the moving object is equal to or higher than a predetermined speed, and wherein the control unit is configured to determine, among emission directions (225, 226, 227) of the electromagnetic wave in the first scan, an emission direction that satisfies at least one of a first condition and a second condition for the electromagnetic wave based on the received signal in the first scan, and determines the scan range in the second scan based on the determined emission direction, wherein the first condition is that an emission direction in which an elapsed time between when the measuring unit emits the electromagnetic wave and when the measuring unit receives the electromagnetic wave reflected by the reflection object is closest to a predetermined time or an emission direction in which the elapsed time is included in a predetermined time range from the predetermined time, wherein the second condition is that an emission direction in which a distance to the reflection object is closest to a predetermined distance or an emission direction in which the distance is included in a predetermined distance range, the distance computed based on the received signal of the measuring unit, characterized in that: in the first condition, the predetermined time becomes larger as the value for the speed of the moving object becomes larger, or the lower limit and the upper limit of the predetermined time range become larger as the value for the speed of the moving object becomes larger, and in the second condition, the predetermined distance becomes larger as the value for the speed of the moving object becomes larger, or the lower limit and the upper limit of the predetermined distance range become larger as the value for the speed of the moving object becomes larger. a measuring unit that performs a scan by emitting an electromagnetic wave and receiving the electromagnetic wave reflected by a reflection object; and a control unit that controls the measuring unit, wherein the control unit is configured to determine whether or not a speed of the moving object is equal to or higher than a predetermined speed, and wherein the control unit determines a scan range in a second scan to be performed after a first scan based on a received signal of the measuring unit at the first scan by the measuring unit when it is determined that the speed of the moving object is equal to or higher than a predetermined speed, and wherein the control unit is configured to determine, among emission directions (225, 226, 227) of the electromagnetic wave in the first scan, an emission direction that satisfies at least one of a first condition and a second condition for the electromagnetic wave based on the received signal in the first scan, and determines the scan range in the second scan based on the determined emission direction, wherein the first condition is that an emission direction in which an elapsed time between when the measuring unit emits the electromagnetic wave and when the measuring unit receives the electromagnetic wave reflected by the reflection object is closest to a predetermined time or an emission direction in which the elapsed time is included in a predetermined time range from the predetermined time, wherein the second condition is that an emission direction in which a distance to the reflection object is closest to a predetermined distance or an emission direction in which the distance is included in a predetermined distance range, the distance computed based on the received signal of the measuring unit, characterized in that: in the first condition, the predetermined time becomes larger as the value for the speed of the moving object becomes larger, or the lower limit and the upper limit of the predetermined time range become larger as the value for the speed of the moving object becomes larger, and in the second condition, the predetermined distance becomes larger as the value for the speed of the moving object becomes larger, or the lower limit and the upper limit of the predetermined distance range become larger as the value for the speed of the moving object becomes larger. in the first condition, the predetermined time becomes larger as the value for the speed of the moving object becomes larger, or the lower limit and the upper limit of the predetermined time range become larger as the value for the speed of the moving object becomes larger, and in the second condition, the predetermined distance becomes larger as the value for the speed of the moving object becomes larger, or the lower limit and the upper limit of the predetermined distance range become larger as the value for the speed of the moving object becomes larger.