A passive walking apparatus comprising: a hip portion including a first side portion and a second side portion located opposite to the first side portion ; a first leg coupled to the first side portion ; a second leg coupled to the second side portion ; and the passive walking apparatus is characterized by : a crank mechanism including a first-leg-side crank portion provided on a side of the first side portion , a second-leg-side crank portion provided on a side of the second side portion as being opposite in phase to the first-leg-side crank portion , a crankshaft coupling the first-leg-side crank portion and the second-leg-side crank portion to each other, a first-leg-side connection portion connected to the first leg and the first-leg-side crank portion , and a second-leg-side connection portion connected to the second-leg-side crank portion and the second leg , wherein, when the first leg moves rearward from front relatively to the hip portion as being in contact with a walking surface, the first-leg-side connection portion causes the first-leg-side crank portion to pivot, the first-leg-side crank portion causes the second-leg-side crank portion to pivot around the crankshaft , and the second-leg-side crank portion moving the second leg forward from rear relatively to the hip portion with the second-leg-side connection portion being interposed. a hip portion including a first side portion and a second side portion located opposite to the first side portion ; a first leg coupled to the first side portion ; a second leg coupled to the second side portion ; and the passive walking apparatus is characterized by : a crank mechanism including a first-leg-side crank portion provided on a side of the first side portion , a second-leg-side crank portion provided on a side of the second side portion as being opposite in phase to the first-leg-side crank portion , a crankshaft coupling the first-leg-side crank portion and the second-leg-side crank portion to each other, a first-leg-side connection portion connected to the first leg and the first-leg-side crank portion , and a second-leg-side connection portion connected to the second-leg-side crank portion and the second leg , wherein, when the first leg moves rearward from front relatively to the hip portion as being in contact with a walking surface, the first-leg-side connection portion causes the first-leg-side crank portion to pivot, the first-leg-side crank portion causes the second-leg-side crank portion to pivot around the crankshaft , and the second-leg-side crank portion moving the second leg forward from rear relatively to the hip portion with the second-leg-side connection portion being interposed. a crank mechanism including a first-leg-side crank portion provided on a side of the first side portion , a second-leg-side crank portion provided on a side of the second side portion as being opposite in phase to the first-leg-side crank portion , a crankshaft coupling the first-leg-side crank portion and the second-leg-side crank portion to each other, a first-leg-side connection portion connected to the first leg and the first-leg-side crank portion , and a second-leg-side connection portion connected to the second-leg-side crank portion and the second leg , wherein, when the first leg moves rearward from front relatively to the hip portion as being in contact with a walking surface, the first-leg-side connection portion causes the first-leg-side crank portion to pivot, the first-leg-side crank portion causes the second-leg-side crank portion to pivot around the crankshaft , and the second-leg-side crank portion moving the second leg forward from rear relatively to the hip portion with the second-leg-side connection portion being interposed. <EOS>