Kata-guruma (肩車), the shoulder wheel.

Nage-waza (throwing techniques), Te-waza (hand techniques), Gokyo 3rd set (Dai-sankyo).
Required for: 15th Mon (blue belt, British Judo Association); 1st Kyu (brown belt, JudoScotland); 4th Dan (black belt, British Judo Association); 5th Dan (black belt, British Judo Association).
Also known as: fireman's carry (wrestling).

About
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Uke is drawn across tori's shoulders and wheeled over them, in the fireman's-carry position.

Step by step (standard right-handed form)
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1. From a right-handed grip, pull your partner's right sleeve out and forward so their arm extends and their weight starts to come towards you.
2. Drop into a deep crouch and step in, your feet wide and stable, your head ducking to the right side of their body.
3. Reach your right arm between their legs and wrap it around their right thigh, while the sleeve pull draws their upper body down across the back of your shoulders.
4. Stand up with your legs, their body balanced across your shoulders like a beam, sleeve hand and thigh arm holding them steady.
5. Dip your left shoulder and pull the sleeve down so they slide off your shoulders towards your left front.
6. They land on their back in front of you and to your left; keep the sleeve until they are down.

Key points
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1. Drop low with a wide, stable stance as you enter
2. Draw uke across the shoulders with a strong sleeve pull
3. Lift with the legs and wheel uke over, never with the back alone

Receiving it
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You are pulled low across their shoulders as they squat under you, an arm wrapping your thigh; for a moment you are carried, level, off the ground. The dip of their shoulder tells you the throw is coming. You slide off into a fall from height, so stay relaxed, chin tucked, and slap with your free arm as your back lands.

Reference pages elsewhere
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Kata-guruma on the IJF technique reference (International Judo Federation): https://judo.ijf.org/techniques/Kata-guruma

From Waza Book: https://wazabook.com/techniques/kata-guruma/