A toolbox includes a base receiving a supporting seat having a first pivotal portion with a positioning protrusion. A limiting protrusion is formed between the positioning protrusion and a groove. A socket includes a second pivotal portion pivotably connected to the first pivotal portion. An operating rod is received in the socket and is pivotable together with the socket between a storage position and two extended positions. The positioning protrusion is selectively engaged in one of three positioning grooves in the second pivotal portion. The socket includes a first sidewall having a resilient tongue with a protrusion engaged in an annular groove of the operating rod. The second socket further includes a second sidewall having a through-hole through which the limiting protrusion can extend. A projection is formed on the second sidewall and is engaged in the groove of the supporting seat when the socket is in the storage position.