the arrowhead of the present invention having the structure described above the expanding blades 130 are always maintained in a state of engaging with the rack gear portion 154 therefore the expanding blades 130 are stably maintained in the retracted state while the arrow is flying when no impact has been applied thereon but on the other hand the expanding blades 130 quickly and efficiently expand when they hit the target therefore an additional means for preventing the unexpected expansion of the expanding blades 130 during flight of the arrow is not required and a hitting effect against the target is reliable such that ascendancy over the game can be quickly and efficiently gained in a short time in the embodiment shown three expanding blades 130 are installed on the outer surface of the main body 120 at intervals of 120 degrees in a circumferential direction however it is not necessary to limit the configuration to that shown and the number of the expanding blades 130 may be two or four or more as required in the above embodiment an up and down rotation angle between the retracted state and the expanded state of the expanding blades 130 is preferably but not limited to between roughly 100 degrees to 120 degrees as set forth above the present arrowhead has a plurality of expanding blades to more efficiently and reliably hit game which is the target in which an operation of retracting or expanding the expanding blades can be reliably.