A portable speaker having a base, a cover, a scissors mechanism, a positioning mechanism, a restoring element, a push-push type mechanism and a speaker module is provided. The scissors mechanism, the positioning mechanism, the restoring element, the push-push type mechanism are disposed between the base and the cover, respectively. The scissors mechanism translates the cover vertically. The positioning mechanism translates the cover to an original position, a first position or a second position. The restoring element repositions the cover from the first position to the original position or the second position. The push-push type mechanism fixes the cover to the original position or the second position. The speaker module is disposed in the base or the cover, wherein the sound from the speaker module is able to be output from the interval between the base and the cover when the cover is at the second position.