PURPOSE: A micro acceleration switch of a machine is provided to be reliable, to give repeatable contact resistance, to save cost, to simply produce and to use as a two-shaft acceleration switch. CONSTITUTION: A micro switch is made up of a switch housing(50 connected to an electrode element by mediating a twisting spring element(3), and the electrode element(4) includes a thin rod(1) having an electric contact on a front end on the outside. In addition, a test weight(2) is placed to have a center in a certain distance from a turning shaft of the electrode element defined by a spring element(3). Herein, when the switch does an acceleration movement having a parallel direction element on the shaft of the electrode element, the test weight and the turning electrode element is turned to the shaft of a spring(3), and the rod moves on the surface of the rod. Thereby, since the contact point touches the corresponding contact area inside the switch housing, an electric signal for pointing that a certain limit is exceeded.
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