link arm 120 is hinge connected and guides a linear movement of the stand support 130 the stand 110 includes a plate portion 111 which has a specific width and of which one end is formed with a hole 114 for the hinge connection to the stand support 130 via a pin 164 or the like the link arm 120 includes a link portion 121 which has a specific width and of which both ends include holes 122 illustrated in fig3 and 123 for the hinge connection to the base panel 140 the stand support 130 includes a sliding portion 131 which moves linearly guided by the base panel 140 the sliding portion 131 forms a hinge arm 134 for the hinge connection to the stand 110 in particular the stand support 130 includes a locking portion 132 illustrated in fig3 to provide stepwise movements when moving linearly by interacting with the base panel 140 the base panel 140 includes a hinge arm 143 for the hinge connection to the link arm 120 using the pin 161 or the like and a body 141 formed with a guard portion 144 to guide a linear movement of the sliding portion 131 of the stand support 130 in particular the body 141 includes a push protrusion 142 to provide stepwise movements of the stand support 130 by elastically pushing the locking portion 132 of the stand support 130 in the embodiment the push protrusion 142 may protrude inside an opening portion formed in the sliding portion 131 the stand device 100 may further includes a guide bar 163 to avoid deterioration of the stepwise movements by supporting the push protrusion.