Disclosed is an overcurrent detection device for detecting an overcurrent in a load circuit which is arranged to control the driving and the stopping of a load 1 by a semiconductor switch (FET1) provided between a battery VB and the load 1. An added voltage (V1−V3) is generated which is obtained by adding a voltage (V1−V2) generated across the both ends of the semiconductor switch (FET1) to a voltage (V3−V2) which is generated at the time of current change due to the inductance Lp of a copper foil wiring pattern 3 for coupling the semiconductor switch (FET1) and the load 1. A comparator CMP1 for comparing the added voltage with an overcurrent determination voltage (V1−V4) set in advance is provided. When the comparator CMP1 detects that the added voltage exceeds the overcurrent determination voltage, it is determined that an overcurrent is generated.